Dec. 2011, Encouragement award, The Surface Science Society of Japan
Hitoshi Abe

2010, 井上研究奨励賞（第27回）

2010, Inoue Research Award for Young Scientists

2009, 表面科学学術講演会 講演奨励賞

2009, SSSJ Young-Researcher Lecture Award

2008, The Best Poster Prize, International Symposium on Surface Science and Nanotechnology 5 (ISSS-5)

2008, 東京大学大学院理学系研究科研究奨励賞

2008, The Best Poster Prize, International Symposium on Surface Science and Nanotechnology 5 (ISSS-5)

2008, Research encouragement award, Graduate School of Science, Tokyo University

2004, XAFS討論会 スチューデント奨励賞

2004, Student encouragement award, Japan XAFS conference

Ammonia Decomposition over Water‐Durable Hexagonal BaTiO3−xNy‐Supported Ni Catalysts
Kiya Ogasawara; Masayoshi Miyazaki; Kazuki Miyashita; Hitoshi Abe; Yasuhiro Niwa; Masato Sasase; Masaaki Kitano; Hideo Hosono
Advanced Energy Materials, 25 Jul. 2023, [Reviewed]

Berry curvature contributions of kagome-lattice fragments in amorphous Fe–Sn thin films
Kohei Fujiwara; Yasuyuki Kato; Hitoshi Abe; Shun Noguchi; Junichi Shiogai; Yasuhiro Niwa; Hiroshi Kumigashira; Yukitoshi Motome; Atsushi Tsukazaki, Abstract

Amorphous semiconductors are widely applied to electronic and energy-conversion devices owing to their high performance and simple fabrication processes. The topological concept of the Berry curvature is generally ill-defined in amorphous solids, due to the absence of long-range crystalline order. Here, we demonstrate that the Berry curvature in the short-range crystalline order of kagome-lattice fragments effectively contributes to the anomalous electrical and magneto-thermoelectric properties in Fe–Sn amorphous films. The Fe–Sn films on glass substrates exhibit large anomalous Hall and Nernst effects comparable to those of the single crystals of topological semimetals Fe₃Sn₂ and Fe₃Sn. With modelling, we reveal that the Berry curvature contribution in the amorphous state likely originates from randomly distributed kagome-lattice fragments. This microscopic interpretation sheds light on the topology of amorphous materials, which may lead to the realization of functional topological amorphous electronic devices., Springer Science and Business Media LLC
Nature Communications, 13 Jun. 2023

Surface oxidation and Fe valency distribution in celadon glaze revealed by depth-resolved Fe K-edge X-ray absorption spectroscopy
Angelo P. Rillera; Mayrene A. Uy; Keito Shinohara; Melvin John F. Empizo; Toshihiko Shimizu; Hideki Yoshida; Nobuhiko Sarukura; Hitoshi Abe, Elsevier BV
Journal of the European Ceramic Society, May 2023

Boosted Activity of Cobalt Catalysts for Ammonia Synthesis with BaAl₂O_4–xH_y Electrides
Yihao Jiang; Ryu Takashima; Takuya Nakao; Masayoshi Miyazaki; Yangfan Lu; Masato Sasase; Yasuhiro Niwa; Hitoshi Abe; Masaaki Kitano; Hideo Hosono, American Chemical Society (ACS)
Journal of the American Chemical Society, 27 Apr. 2023

Data Mining from XANES Spectra of Nickel Complexes for Structure Estimation
Kentaro Fuku; Takefumi Yoshida; Tetsu Sato; Hiroaki Iguchi; Shinya Takaishi; Ryota Sakamoto; Hitoshi Abe, The Chemical Society of Japan
Chemistry Letters, 03 Mar. 2023

Radiation resistance of praseodymium-doped aluminum lithium fluorophosphate scintillator glasses for laser fusion experiments
Keito Shinohara; Melvin John F. Empizo; Marilou Cadatal-Raduban; Kohei Yamanoi; Toshihiko Shimizu; Masashi Yoshimura; Nobuhiko Sarukura; Takahiro Murata; Mayrene A. Uy; Hitoshi Abe; Akira Yoshikawa; Georges Boulon; Christophe Dujardin, Abstract

We report the gamma (γ)-ray radiation resistance of praseodymium (Pr³⁺)-doped aluminum lithium fluorophosphate scintillator glasses. For its assessment as a scintillator material for laser fusion experiments, a 20Al(PO₃)₃-80LiF-PrF₃ (Pr³⁺-doped APLF) glass was irradiated with γ-rays from a cobalt-60 (⁶⁰Co) source resulting in an absorbed dose of 5.2 kGy. Although γ-ray-irradiation results in increased absorption due to phosphorus-oxygen hole centers (POHCs) and PO₃²⁻ electron centers (PO₃ ECs), these radiation-induced defects do not modify the glass emission as both non-irradiated and γ-ray-irradiated glasses exhibit similar emission spectra and decay times under optical and X-ray excitation. The emission peaks observed also correspond to the different interconfigurational 4f5d → 4f² and intraconfigurational 4f² transitions of Pr³⁺ ions which are neither oxidized nor reduced by irradiation. Our results show that Pr³⁺-doped APLF glass still maintains its characteristic fast decay time and that γ-ray irradiation does not affect the glass scintillation mechanisms., IOP Publishing
Japanese Journal of Applied Physics, 01 Jan. 2023

Anomalous Cu phase observed at HIP bonded Fe–Cu interface
Hitoshi Abe; Masahiro Onoi; Atsuro Kimura
The Journal of Chemical Physics, 21 Dec. 2022

Evidence of Undistorted 8-Coordinated Cubic (O_h) Ce³⁺ Center in Moderately-Doped (0.01 mol %) CaF₂ Single Crystal
Mayrene Uy; Keito Shinohara; Melvin John F. Empizo; Toshihiko Shimizu; Masashi Yoshimura; Nobuhiko Sarukura; Akira Yoshikawa; Hitoshi Abe, Physical Society of Japan
Journal of the Physical Society of Japan, 15 Dec. 2022

Low-Temperature Methanol Synthesis by a Cu-Loaded LaH_2+x Electride
Hironobu Sugiyama; Takuya Nakao; Masayoshi Miyazaki; Hitoshi Abe; Yasuhiro Niwa; Masaaki Kitano; Hideo Hosono, American Chemical Society (ACS)
ACS Catalysis, 02 Oct. 2022

Approach to Chemically Durable Nickel and Cobalt Lanthanum‐Nitride‐Based Catalysts for Ammonia Synthesis
Yangfan Lu; Tian-Nan Ye; Jiang Li; Zichuang Li; Haotian Guan; Masato Sasase; Yasuhiro Niwa; Hitoshi Abe; Qian Li; Fushen Pan; Masaaki Kitano; Hideo Hosono, Wiley
Angewandte Chemie International Edition, 26 Sep. 2022

Broccoli microgreens treated with CaCl2 solution absorb calcium atoms and accumulate them as Ca(II) hydrated ions
Hitoshi Abe; Hiromi Oshita, Elsevier {BV}
Radiation Physics and Chemistry, Sep. 2022, [Reviewed]

Non-innocent redox behavior of Cu-II-p-dimethylaminophenolate complexes: formation and characterization of the Cu-I-phenoxyl radical species
Yuto Shima; Takashi Suzuki; Hitoshi Abe; Tatsuo Yajima; Seiji Mori; Yuichi Shimazaki, Cu complexes with p-dimethylaminophenolate ligands were synthesized by the reaction of Cu-II ions with the ligands under inert gas atmosphere and characterized. The complexes showed a valence state change from Cu-II-phenolate to Cu-I-phenoxyl radical on loss of the coordinated solvent. The Cu-I-phenoxyl radical species showed the characteristic properties and reactivities., ROYAL SOC CHEMISTRY
CHEMICAL COMMUNICATIONS, May 2022

Insight into the Gd–Pt Bond: Slow Magnetic Relaxation of a Heterometallic Gd–Pt Complex
Takefumi Yoshida; Ahmed Shabana; Haitao Zhang; David Chukwuma Izuogu; Tetsu Sato; Kentaro Fuku; Hitoshi Abe; Yoji Horii; Goulven Cosquer; Norihisa Hoshino; Tomoyuki Akutagawa; Alex J. W. Thom; Shinya Takaishi; Masahiro Yamashita, The Chemical Society of Japan
Bulletin of the Chemical Society of Japan, 10 Feb. 2022

Synergistic Effects of Earth-Abundant Metal–Metal Oxide Enable Reductive Amination of Carbonyls at 50 °C
Manas K. Bhunia; Debraj Chandra; Hitoshi Abe; Yasuhiro Niwa; Michikazu Hara, Reductive amination of carbonyls to primary amines is of importance to the synthesis of fine chemicals; however, this reaction with heterogeneous catalysts containing earth-abundant metals under mild conditions remains scarce. Here, we show that the nickel catalyst with mixed oxidation states enables such synthesis of primary amines under low temperature (50 °C) and H2 pressure (0.9 MPa). The catalyst shows activity in both water and toluene. The high activity likely results from the formation of small (ca. 4.6 nm) partially oxidized nickel nanoparticles (NPs) homogeneously anchored onto the silica and their synergistic effect. Detailed characterizations indicate stabilization of NPs through strong metal support interaction via electron donation from the metal to support. We identify that the support endowed with an amphoteric nature shows better performance. This strategy of making small metal–metal oxide NPs will open an avenue toward the rational development of efficient catalysts that would allow for other organic transformations under mild reaction conditions.
ACS Applied Materials and Interfaces, 26 Jan. 2022

Unique atomic structure of metals at the moment of fracture induced by laser shock
Yasuhiro Niwa; Kei Takahashi; Tokushi Sato; Kouhei Ichiyanagi; Hitoshi Abe; Masao Kimura, Elsevier BV
Materials Science and Engineering: A, Jan. 2022

Element dependence of local disorder in medium-entropy alloy CrCoNi
N. Hanasaki; M. Oda; K. Niitsu; K. Ehara; H. Murakawa; H. Sakai; H. Nitani; H. Abe; H. Sagayama; H. Uetsuka; T. Karube; H. Inui, AIP Publishing
AIP Advances, 01 Dec. 2021

Solid State Characterization of One‐ and Two‐Electron Oxidized Cu ^II ‐salen Complexes with para ‐Substituents: Geometric Structure‐Magnetic Property Relationship
Takeyama Tomoyuki; Takashi Suzuki; Misa Kikuchi; Misato Kobayashi; Hiromi Oshita; Kyohei Kawashima; Seiji Mori; Hitoshi Abe; Norihisa Hoshino; Satoshi Iwatsuki; Yuichi Shimazaki, Wiley
European Journal of Inorganic Chemistry, 21 Oct. 2021, [Reviewed]

Generating Mechanism of Catalytic Effect for Hydrogen Absorption/Desorption Reactions in NaAlH4–TiCl3
Kazutaka Ikeda; Fumika Fujisaki; Toshiya Otomo; Hidetoshi Ohshita; Takashi Honda; Toru Kawamata; Hiroshi Arima; Kazumasa Sugiyama; Hitoshi Abe; Hyunjeong Kim; Kouji Sakaki; Yumiko Nakamura; Akihiko Machida; Toyoto Sato; Shigeyuki Takagi; Shin-ichi Orimo, The hydrogen desorption and absorption reactions of the complex metal hydride NaAlH4 are disproportionation processes, and the kinetics can be improved by adding a few mol% of Ti compounds, although the catalytic mechanism, including the location and state of Ti, remains unknown. In this study, we aimed to reveal the generating mechanism of catalytic Al–Ti alloy in NaAlH4 with TiCl3 using quantum multiprobe techniques such as neutron diffraction (ND), synchrotron X-ray diffraction (XRD), anomalous X-ray scattering (AXS), and X-ray absorption fine structure (XAFS). Rietveld refinements of the ND and XRD, profiles before the first desorption of NaAlD(H)4–0.02TiCl3 showed that Al in NaAlD(H)4 was partially substituted by Ti. On the other hand, Ti was not present in NaAlH4, and Al–Ti nanoparticles were detected in the XRD profile after the first re-absorption. This was consistent with the AXS and XAFS results. It is suggested that the substitution promotes the formation of a highly dispersed nanosized Al–Ti alloy during the first desorption process and that the effectiveness of TiCl3 as an additive can be attributed to the dispersion of Ti., MDPI AG
Applied Sciences, 09 Sep. 2021

Ammonia Decomposition over CaNH-Supported Ni Catalysts via an NH2–-Vacancy-Mediated Mars–van Krevelen Mechanism
Kiya Ogasawara; Takuya Nakao; Kazuhisa Kishida; Tian-Nan Ye; Yangfan Lu; Hitoshi Abe; Yasuhiro Niwa; Masato Sasase; Masaaki Kitano; Hideo Hosono, American Chemical Society (ACS)
ACS Catalysis, 03 Sep. 2021

Ruthenium Catalysts Promoted by Lanthanide Oxyhydrides with High Hydride‐Ion Mobility for Low‐Temperature Ammonia Synthesis
Kayato Ooya; Jiang Li; Keiga Fukui; Soshi Iimura; Takuya Nakao; Kiya Ogasawara; Masato Sasase; Hitoshi Abe; Yasuhiro Niwa; Masaaki Kitano; Hideo Hosono, Wiley
Advanced Energy Materials, Jan. 2021

Formation of Ni(ii)-phenoxyl radical complexes by O2: a mechanistic insight into the reaction of Ni(ii)-phenol complexes with O2
Takashi Suzuki; Akari Sato; Hiromi Oshita; Tatsuo Yajima; Fumito Tani; Hitoshi Abe; Kaoru Mieda-Higa; Sachiko Yanagisawa; Takashi Ogura; Yuichi Shimazaki,

The reaction of Ni(ii)-(phenol)(phenolate) complexes with O₂ gave the Ni(ii)-phenoxyl radical complexes assisted by CH₃OH. This reaction was concluded to undergo via the proton transfer–electron transfer type mechanism without redox of the Ni ion.

, Royal Society of Chemistry ({RSC})
Dalton Transactions, 2021

Intermetallic ZrPd3-Embedded Nanoporous ZrC as an Efficient and Stable Catalyst of the Suzuki Cross-Coupling Reaction
Yangfan Lu; Tian-Nan Ye; Sang-Won Park; Jiang Li; Masato Sasase; Hitoshi Abe; Yasuhiro Niwa; Masaaki Kitano; Hideo Hosono, American Chemical Society ({ACS})
ACS Catalysis, 18 Dec. 2020

Stable single platinum atoms trapped in sub-nanometer cavities in 12CaO·7Al2O3 for chemoselective hydrogenation of nitroarenes
Tian-Nan Ye; Zewen Xiao; Jiang Li; Yutong Gong; Hitoshi Abe; Yasuhiro Niwa; Masato Sasase; Masaaki Kitano; Hideo Hosono, Springer Science and Business Media LLC
Nature Communications, Dec. 2020, [Reviewed]

A surface sensitive hard X-ray spectroscopic method applied to observe the surface layer reduction reaction of Co oxide to Co metal
Hitoshi Abe; Yasuhiro Niwa; Masao Kimura, Lead,

In situ TREXS captures surface reactions.

, Royal Society of Chemistry (RSC)
Physical Chemistry Chemical Physics, 03 Nov. 2020, [Reviewed], [Invited]

Air-Stable Calcium Cyanamide-Supported Ruthenium Catalyst for Ammonia Synthesis and Decomposition
Kazuhisa Kishida; Masaaki Kitano; Masato Sasase; Peter V. Sushko; Hitoshi Abe; Yasuhiro Niwa; Kiya Ogasawara; Toshiharu Yokoyama; Hideo Hosono, Copyright © 2020 American Chemical Society. Efficient ammonia synthesis and decomposition processes under mild conditions are important to meet the expanding demand in major applications of ammonia as the energy carrier and to provide feedstock for chemical industry. Here, we report that air-stable calcium cyanamide-supported ruthenium (Ru/CaCN2) works as an efficient and stable catalyst for ammonia synthesis and decomposition. Ru/CaCN2 exhibits greater catalytic performances for both reactions than Ru/Ca2N electride and Ru-Cs/MgO. The kinetic analysis for ammonia synthesis suggests that Ru/CaCN2 exhibits low apparent activation energy and high resistance to hydrogen poisoning, which has characteristics similar to the kinetic parameters of Ru-supported electride catalyst. H2-temperature programmed reaction and temperature programmed desorption revealed that Ru promoted the formation of CN2 vacancies on the CaCN2 surface which in turn capture hydrogen as H- ions during the reaction. Density functional theory calculations provide insights into how the formation of CN2 vacancies is promoted by Ru, which leads to the decrease in the work function of the CaCN2 surface and the hydrogen capture at the Ru-support interface. These results suggest that the high catalytic performance of Ru/CaCN2 can be attributed to the formation of a quasi-electride structure at the Ru-CaCN2 interface., American Chemical Society (ACS)
ACS Applied Energy Materials, 27 Jul. 2020, [Reviewed]

Residual Stress and Wear Resistance of HVOF Inconel 625 Coating on SS304 Steel Substrate
O. P. Oladijo; V. Luzin; N. B. Maledi; K. Setswalo; T. P. Ntsoane; H. Abe, Springer Science and Business Media {LLC}
Journal of Thermal Spray Technology, 08 Jul. 2020

Electrochromic Os-based metallo-supramolecular polymers: electronic state tracking by in situ XAFS, IR, and impedance spectroscopies
Takefumi Yoshida; Manas Kumar Bera; Yemineni S. L. V. Narayana; Sanjoy Mondal; Hitoshi Abe; Masayoshi Higuchi,

In this study, the electronic states of Os-based metallo-supramolecular polymers (poly(OsL)2+) during electrochromism were tracked by in situ X-ray absorption fine structure (XAFS), infrared (IR), and impedance spectroscopies.

, Royal Society of Chemistry (RSC)
RSC Advances, 2020, [Reviewed]

Polar nano-region structure in the oxynitride perovskite LaTiO2N
Jun-ichi Yamaura; Sachiko Maki; Takashi Honda; Yoshio Matsui; Alfian Noviyanto; Toshiya Otomo; Hitoshi Abe; Youichi Murakami; Naoki Ohashi, Royal Society of Chemistry ({RSC})
Chemical Communications, 2020, [Reviewed]

Ionic-caged heterometallic bismuth–platinum complex exhibiting electrocatalytic CO2 reduction
Takefumi Yoshida; Habib Md. Ahsan; Hai-Tao Zhang; David Chukwuma Izuogu; Hitoshi Abe; Hiroyoshi Ohtsu; Tadashi Yamaguchi; Brian K. Breedlove; Alex J. W. Thom; Masahiro Yamashita, Royal Society of Chemistry ({RSC})
Dalton Transactions, 2020, [Reviewed]

Low-Temperature Synthesis of Perovskite Oxynitride-Hydrides as Ammonia Synthesis Catalysts
Masaaki Kitano; Jun Kujirai; Kiya Ogasawara; Satoru Matsuishi; Tomofumi Tada; Hitoshi Abe; Yasuhiro Niwa; Hideo Hosono, American Chemical Society ({ACS})
Journal of the American Chemical Society, 26 Dec. 2019, [Reviewed]

Palladium-bearing intermetallic electride as an efficient and stable catalyst for Suzuki cross-coupling reactions
Ye Tian-Nan; Lu Yangfan; Xiao Zewen; Li Jiang; Nakao Takuya; Abe Hitoshi; Niwa Yasuhiro; Kitano Masaaki; Tada Tomofumi; Hosono Hideo, Suzuki cross-coupling reactions catalyzed by palladium are powerful tools for the synthesis of functional organic compounds. Excellent catalytic activity and stability require negatively charged Pd species and the avoidance of metal leaching or clustering in a heterogeneous system. Here we report a Pd-based electride material, Y₃Pd₂, in which active Pd atoms are incorporated in a lattice together with Y. As evidenced from detailed characterization and density functional theory (DFT) calculations, Y₃Pd₂ realizes negatively charged Pd species, a low work function and a high carrier density, which are expected to be beneficial for the efficient Suzuki coupling reaction of activated aryl halides with various coupling partners under mild conditions. The catalytic activity of Y₃Pd₂ is ten times higher than that of pure Pd and the activation energy is lower by nearly 35%. The Y₃Pd₂ intermetallic electride catalyst also exhibited extremely good catalytic stability during long-term coupling reactions., Springer Science and Business Media LLC
NATURE COMMUNICATIONS, 11 Dec. 2019, [Reviewed]

Formation of the Cu-II-Phenoxyl Radical by Reaction of O-2 with a Cu-II-Phenolate Complex via the Cu-I-Phenoxyl Radical
Takashi Suzuki; Hiromi Oshita; Tatsuo Yajima; Fumito Tani; Hitoshi Abe; Yuichi Shimazakix, Reaction of Cu(ClO4)(2).6 H2O with a tripodal 2N2O ligand, H2Me2NL, having a p-(dimethylamino)phenol moiety, in CH2Cl2/MeOH (1:1 v/v) under basic conditions under an inert gas atmosphere gave [Cu(Me2NL)(H2O)] (1). The same reaction carried out under aerobic conditions gave [Cu(Me2NL)(MeOH)]ClO4 (2), which could be obtained also from the isolated complex 1 by reaction with O-2 in CH2Cl2/MeOH. The X-ray crystal structures of 1 and 2 revealed similar square-pyramidal structures, but 2 showed the (dimethylamino)phenoxyl radical features. Complex 1 exhibits characteristic Cu-II EPR signals of the dx2-y2 ground state in CH2Cl2/MeOH at 77 K, whereas 2 is EPR-silent. The EPR and X-ray absorption fine structure (XAFS) results suggest that 2 is assigned to the Cu-II-(dimethylamino)phenoxyl radical. However, complex 1 showed different features in the absence of MeOH. The EPR spectrum of the CH2Cl2 solution of 1 exhibits distortion from the dx2-y2 ground state and a temperature-dependent equilibrium between the Cu-II-(dimethylamino)phenolate and the Cu-I-(dimethylamino)phenoxyl radical. From these results, Cu-II-phenoxyl radical complex 2 is concluded to be formed by the reaction of 1 with O-2 via the Cu-I-phenoxyl radical species., WILEY-V C H VERLAG GMBH
CHEMISTRY-A EUROPEAN JOURNAL, Dec. 2019, [Reviewed]

An XAFS study of Cs adsorption by the precipitation bands of Mn−Fe-based Prussian blue analogues spontaneously formed in agarose gel
H. Hayashi; S. Aoki; M. Takaishi; Y. Sato; H. Abe
Phys. Chem. Chem. Phys., Oct. 2019, [Reviewed]

Idea of Thin Film Beam Splitters for Two-Colour Beamlines
H. Abe
J. Synchrotron Rad., Sep. 2019, [Reviewed]

The effect of pi-pi stacking interaction of the indole ring with the coordinated phenoxyl radical in a nickel (II)-salen type complex. Comparison with the corresponding Cu(II) complex
Hiromi Oshita; Takashi Suzuki; Kyohei Kawashima; Hitoshi Abe; Fumito Tani; Seiji Mori; Tatsuo Yajima; Yuichi Shimazaki, In order to gain new insights into the effect of the pi-pi stacking interaction of the indole ring with the phenoxyl radical moiety as seen in the active form of galactose oxidase, we have prepared Ni(s) complexes of a methoxy substituted salen-type ligand containing a pendent indole ring on the dinitrogen chelate backbone and characterized their one-electron oxidized forms. The X-ray crystal structure analysis and the other physicochemical experiments of the Ni(s) complex revealed no significant intramolecular interaction of the indole ring with the coordination plane. On the other hand, the X-ray crystal structures of the oxidized Ni(ii) complex exhibited the pi-pi stacking interaction of the indole ring mainly with one of the two phenolate moieties. While the phenoxyl radical electron was delocalized on the two phenolate moieties in the Ni(s)-salen coordination plane, the phenolate moiety in close contact with the indole moiety was considered to be the initial oxidation locus, indicating that the indole ring interacted with the phenoxyl radical by pi-pi stacking. The UV vis NIR spectrum of the oxidized Ni(ii) complex with the pendent indole ring was different from that of the complex without the side chain indole ring, but the differences were rather small in comparison with the oxidized Cu(ii)-salen complexes with the pi-pi stacking interaction of the indole ring. Such differences are due to the electronic structure difference, the localized radical electron on one of the phenolate moieties in the oxidized Cu(ii) complexes being more favorable for then pi-pi stacking interaction., ROYAL SOC CHEMISTRY
DALTON TRANSACTIONS, Aug. 2019, [Reviewed]

pi-pi Stacking Interaction in an Oxidized Cu-II-Salen Complex with a Side-Chain Indole Ring: An Approach to the Function of the Tryptophan in the Active Site of Galactose Oxidase
Hiromi Oshita; Takashi Suzuki; Kyohei Kawashima; Hitoshi Abe; Fumito Tani; Seiji Mori; Tatsuo Yajima; Yuichi Shimazaki, In order to gain new insights into the effect of the pi-pi stacking interaction of the indole ring with the Cu-II-phenoxyl radical as seen in the active form of galactose oxidase, we have prepared a Cu-II complex of a methoxy-substituted salen-type ligand, containing a pendent indole ring on the dinitrogen chelate backbone, and characterized its one-electron-oxidized forms. The X-ray crystal structures of the oxidized Cu-II complex exhibited the pi-pi stacking interaction of the indole ring mainly with one of the two phenolate moieties. The phenolate moiety in close contact with the indole moiety showed the characteristic phenoxyl radical structural features, indicating that the indole ring favors the pi-pi stacking interaction with the phenoxyl radical. The UV/Vis/NIR spectra of the oxidized Cu-II complex with the pendent indole ring was significantly different from those of the complex without the side-chain indole ring, and the absorption and CD spectra exhibited a solvent dependence, which is in line with the phenoxyl radical-indole stacking interaction in solution. The other physicochemical results and theoretical calculations strongly support that the indole ring, as an electron donor, stabilizes the phenoxyl radical by the pi-pi stacking interaction., WILEY-V C H VERLAG GMBH
CHEMISTRY-A EUROPEAN JOURNAL, Jun. 2019, [Reviewed]

Porous Molecular Conductor: Electrochemical Fabrication of Through-Space Conduction Pathways among Linear Coordination Polymers　　　　　　　　　　　　　　　
L. Qu; H. Iguchi; S. Takaishi; F. Habib; C. Leong; D. D'Alessandro; T. Yoshida; H. Abe; E. Nishibori; M. Yamashita
J. Am. Chem. Soc., Apr. 2019, [Reviewed]

In situ TREXS Observation of Surface Reduction Reaction of NiO Film with ~2 nm Surface Sensitivity　　　　　　　　　　　　　　　
H. Abe; Y. Niwa; Y. Takeichi; M. Kimura
Chem. Rec., Mar. 2019, [Reviewed]

Ln–Pt electron polarization effects on the magnetic relaxation of heterometallic Ho– and Er–Pt complexes
Takefumi Yoshida; David C. Izuogu; Hai-Tao Zhang; Goulven Cosquer; Hitoshi Abe; Wolfgang Wernsdorfer; Brian K. Breedlove; Masahiro Yamashita, Royal Society of Chemistry ({RSC})
Dalton Transactions, 2019, [Reviewed]

Direct Activation of Cobalt Catalyst by 12CaO·7Al2O3 Electride for Ammonia Synthesis　　　　　　　　　　　　　　　
Y. Inoue; M. Kitano; M. Tokunari; T. Taniguchi; K. Ooya; H. Abe; Y. Niwa; M. Sasase; M. Hara; H. Hosono
ACS Catalysis, Jan. 2019, [Reviewed]

Development of Multi-Modal Surface Research Equipment by Combining TREXS with IRRAS　　　　　　　　　　　　　　　
H. Abe; Y. Niwa; M. Kimura
AIP Conf. Proc., Jan. 2019, [Reviewed]

Nanoscale Ice-type Structural Fluctuation in Spinel Titanates
S. Torigoe; T. Hattori; K. Kodama; T. Honda; H. Sagayama; K. Ikeda; T. Otomo; H. Nitani; H. Abe; H. Murakawa; H. Sakai; N. Hanasaki, American Physical Society (APS)
Phys. Rev. B, Oct. 2018, [Reviewed]

Slow magnetic relaxation in Tb(III)-based coordination polymer　　　　　　　　　　　　　　　
T. Yoshida; Y. S. L. V. Narayana; H. Abe; M. Higuchi
Dalton Trans., Sep. 2018, [Reviewed]

Improving the quality of XAFS data　　　　　　　　　　　　　　　
H. Abe; G. Aquilanti; R. Boada; B. Bunker; P. Glatzel; M. Nachtegaalf; S. Pascarelli
J. Synchrotron Rad., Jul. 2018, [Reviewed]

The challenge of constructing an international XAFS database　　　　　　　　　　　　　　　
K. Asakura; H. Abe; M. Kimura
J. Synchrotron Rad., Jul. 2018, [Reviewed]

A call for a round robin study of XAFS stability and platform dependence at synchrotron beamlines on well defined samples　　　　　　　　　　　　　　　
C. T. Chantler; B. A. Bunker; H. Abe; M. Kimura; M. Newville; E. Welter
J. Synchrotron Rad., Jul. 2018, [Reviewed]

X-ray spectroscopic analysis of stochastic, periodic precipitation in Co-Fe-Based Prussian blue analogues
Hisashi Hayashi; Yui Sato; Hitoshi Abe, Inorganic precipitates sometimes spontaneously create complex, interesting banding structures in gels, which are potentially applicable in materials engineering. A new member of such self-organizing bandings, i.e., stochastic, periodic banding of the precipitates of Co-Fe-based Prussian blue analogues (Co-Fe PBAs), denoted as "pattern-A", was observed in water-glass gels. The pattern-A periodic bands did not obey empirical scaling laws that many Liesegang bands follow, illustrating the importance of ripening effects. Time-resolved X-ray fluorescence (XRF) and position-dependent X-ray absorption near-edge structure (XANES) measurements were conducted for a pattern-A sample, which was prepared from 0.30 M CoCl2 and 0.05 M K3[Fe(CN)6] solutions. XRF results demonstrated that the Co-Fe PBA distributions fluctuated highly over the sample tube, including the turbid zone, and suggested that significant Ostwald ripening of the Co-Fe PBAs takes place in the periodic bands. XANES results indicated that the local structures and symmetries of the Co-Fe PBAs in the periodic bands were highly uniform. Furthermore these results are consistent with a model where the periodic bands contain a relatively high concentration of Co-Fe PBAs, with the most dominant local structure being Co(OC)4(NCFe)2, co-existing with [Co(H2O)6]2+ ions. These findings not only provide an interesting piece of information for future self-organization processes of Co-Fe PBAs, but also confirm the potential of the combined X-ray spectroscopic techniques for in-depth analysis of the periodic precipitation phenomenon in gels., Royal Society of Chemistry
Journal of Analytical Atomic Spectrometry, 01 Jun. 2018, [Reviewed]

Chemical state analysis of Ca in Spinach heading to Osteoporosis Prophylaxis　　　　　　　　　　　　　　　
Hitoshi Abe
BIO Clinica, May 2018, [Invited]

Ammonia synthesis and decomposition over Ni-W bimetallic nanoparticle catalyst
Kitano Masaaki; Fukazu Yuhei; Tsuji Yuki; Abe Hitoshi; Niwa Yasuhiro; Hosono Hideo, Sodium Naphthalenideを使った液相還元法を用いて窒素吸着エネルギーの高いWと窒素吸着エネルギーの低いNiを複合化させたNi-W二元系ナノ粒子をCeO₂上に担持した触媒を合成した。Ni-W触媒は、NiのみWのみの場合と比較して高いアンモニア合成活性を示し、活性化エネルギーも大幅に減少した。一方、アンモニア分解反応では、Wを添加するにつれ活性が低下した。, The Japan Petroleum Institute
Proceeding of Annual/Fall Meetings of the Japan Petroleum Institute, 2018

Large Oblate Hemispheroidal Ruthenium Particles Supported on Calcium Amide as Efficient Catalysts for Ammonia Decomposition
Kishida, K.; Kitano, M.; Inoue, Y.; Sasase, M.; Nakao, T.; Tada, T.; Abe, H.; Niwa, Y.; Yokoyama, T.; Hara, M.; Hosono, H.
Chemistry-a European Journal, 2018, [Reviewed]

Control of nitrogen activation ability by Co-Mo bimetallic nanoparticle catalysts prepared via sodium naphthalenide-reduction
Tsuji, Y.; Ogasawara, K.; Kitano, M.; Kishida, K.; Abe, H.; Niwa, Y.; Yokoyama, T.; Hara, M.; Hosono, H.
Journal of Catalysis, 2018, [Reviewed]

Magnetic-Field-Induced Painting-Out of Precipitation Bands of Mn-Fe-Based Prussian Blue Analogues in Water-Glass Gels
Hisashi Hayashi; Saya Aoki; Hitoshi Abe, The effect of magnetic fields on the precipitation patterns of Mn-Fe-based Prussian blue analogues in water-glass gels was studied using X-ray fluorescence and X-ray absorption near-edge structure spectroscopies. Three sets of two glass tubes, A, B, and C, were prepared using 1.20 M Mn2+/0.24 M [Fe(CN)6]3-, 0.60 M Mn2+/0.12 M [Fe(CN)6]3-, and 0.30 M Mn2+/0.06 M [Fe(CN)6]3- solutions, respectively. From each of these sets, one tube was subjected to a magnetic field of 0.5 T, whereas the other was not. The magnetic field barely affected the Liesegang bands in the tube from Set A, but there were noticeable differences in the tubes from sets B and C, where (1) the amounts of electrolytes were small, (2) the dominant Mn species was [Mn(H2O)6]2+, and (3) there was stochasticity of the band formation. In these regions, the magnetic field painted out the spaces between the precipitation bands, even enhancing the formation of additional bands., American Chemical Society
ACS Omega, 2018, [Reviewed]

High Electron Density on Ru in Intermetallic YRu2: The Application to Catalyst for Ammonia Synthesis
Ogawa, T.; Kobayashi, Y.; Mizoguchi, H.; Kitano, M.; Abe, H.; Tada, T.; Toda, Y.; Niwa, Y.; Hosono, H.
Journal of Physical Chemistry C, 2018, [Reviewed]

Ternary intermetallic LaCoSi as a catalyst for N-2 activation
Gong, Y. T.; Wu, J. Z.; Kitano, M.; Wang, J. J.; Ye, T. N.; Li, J.; Kobayashi, Y.; Kishida, K.; Abe, H.; Niwa, Y.; Yang, H. S.; Tada, T.; Hosono, H.
Nature Catalysis, 2018, [Reviewed]

Characterization of Group 10-Metal-p-Substituted Phenoxyl Radical Complexes with Schiff Base Ligands.
Hiromi Oshita; Misa Kikuchi; Kaoru Mieda; Takashi Ogura; Takayoshi Yoshimura; Fumito Tani; Tatsuo Yajima; Hitoshi Abe; Seiji Mori; Yuichi Shimazaki, Methylthiophenoxyl radical plays an important role as the active form of galactose oxidase (GO), which catalyzes oxidation of a primary alcohol to the corresponding aldehyde. Although many metal(II)-phenoxyl radical species have been reported, only a few studies have been reported on the properties of methylthiophenoxyl radical-metal complexes. We have prepared the group 10 metal (Ni, Pd and Pt) complexes of a salen-type ligand with a methylthio group at para-position of the two phenolate moieties and characterized them by X-ray crystal structure analyses and various spectroscopic methods in order to understand the role of the methylthio moiety in phenoxyl radical metal complexes. The corresponding pmethoxy substituted derivatives have been also characterized for comparison. All the one-electron oxidized group 10 metal methylthiophenolate complexes have a relatively localized radical site on one of the two phenolate moieties in comparison to the one-electron oxidized complexes of pmethoxy derivatives and exhibit different properties dependent on the central metal ions., WILEY-V C H VERLAG GMBH
CHEMISTRYSELECT, Oct. 2017, [Reviewed]

Chemical State Analysis of Ca in Spinach to establish a field of “XAFS Food Science” heading to Osteoporosis Prophylaxis　　　　　　　　　　　　　　　
Hitoshi Abe
Medical Science Digest, Aug. 2017, [Reviewed]

Nature of the transformation in liquid iodine at 4 GPa
Daisuke Wakabayashi; Nobumasa Funamori; Takumi Kikegawa; Kazuki Watanabe; Shinji Kohara; Hiroaki Nitani; Yasuhiro Niwa; Yasuo Takeichi; Hitoshi Abe; Masao Kimura, To clarify the nature of the transformation in liquid iodine, which is reported to occur at around 4 GPa, we have conducted x-ray absorption fine structure (XAFS) and x-ray diffraction (XRD) measurements up to 9 GPa. In the XAFS spectra, the oscillation attributable to the molecular bond persisted to 9 GPa but showed a significant decay above 4-5 GPa. Similarly, in the pair-distribution function obtained from XRD profiles, the peak assigned to the molecular bond persisted to 9 GPa but showed a significant broadening above 4-5 GPa. While the volume contracts significantly (more than 30%), the molecular bond expands by about 5% with increasing pressure between 1 and 9 GPa. Detailed analyses, with the aid of Reverse Monte Carlo modeling techniques, clarify that the transformation may be characterized by the onset (or drastic increase in the probability) of rebonding among adjacent molecules and the change in electronic state (possibly metallization) without molecular dissociation., AMER PHYSICAL SOC
PHYSICAL REVIEW B, Jul. 2017, [Reviewed]

Gel-State Dependencies of Brown Patterns of Mn-Fe-Based Prussian Blue Analogues Studied by Combined X-ray Spectroscopies
Hisashi Hayashi; Hitoshi Abe, The gel-state dependencies of brown patterns of MnFe- based Prussian blue analogues (PBAs) formed in waterglass gels by reaction-diffusion (RD) processes have been studied by using X-ray fluorescence and X-ray absorption near-edge structure spectroscopies. Three tubes containing admixtures of 0.25M [Fe(CN)(6)](3)(-) and 0.30M acetic acid (A and B) or boric acid (C) in water-glass (9.1 (A) and 7.4 (B and C) mass%) were brought into contact with 0.20M MnSO4 solution. Tube A formed periodic (but not genuine Liesegang) bands, whereas tubes B and C formed light-brown bands in the turbid zone (TZ). A lowered amount of water-glass (A -> B) resulted in a more fluctuant distribution of the PBAs. [Mn(H2O)(6)](2+) ions were also present in the TZ of tube B and their content increased with distance from the gel-junction after stopping the RD process. Addition of boric acid (C) suppressed the RD processes in the gel, slowing down the formation of PBAs. It is likely that the areas of low PBA content in the TZ of tubes B and C generate the light-brown bands. FEFF calculations suggest that the most likely local structures of the predominant PBAs in tubes A/B and C are Mn(NCFe)(2)O4K2 and Mn(NCFe)(2)O-4, respectively., CHEMICAL SOC JAPAN
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, Jul. 2017, [Reviewed]

Anchoring Bond between Ru and N Atoms of Ru/Ca2NH Catalyst: Crucial for the High Ammonia Synthesis Activity
Abe, H.; Niwa, Y.; Kitano, M.; Inoue, Y.; Sasase, M.; Nakao, T.; Tada, T.; Yokoyama, T.; Hara, M.; Hosono, H.
Journal of Physical Chemistry C, 2017, [Reviewed]

Oxidation Number Estimation of Ca in Ca-N Compounds from Ca K-edge XANES Spectra
Abe, H.; Niwa, Y.; Kitano, M.; Inoue, Y.; Yokoyama, T.; Hara, M.; Hosono, H.
Bulletin of the Chemical Society of Japan, 2017, [Reviewed]

An X-ray Spectroscopic Study of Co-Fe-Based Prussian Blue Analog Gels
Hisashi Hayashi; Hitoshi Abe, We performed time-resolved X-ray fluorescence (XRF) and position-dependent X-ray absorption near-edge structure (XANES) spectroscopy on gels containing Co2+ and [Fe(CN)(6)](4-)/[Fe(CN)(6)](3-) ions. Sample tubes containing an agar gel mixed with 0.10M CoCl2 solution and a water-glass gel mixed with 0.05M K-3[Fe(CN)(6)]/K-4[Fe(CN)(6)] solution were prepared for the analyses. Dark-purple continuous (DPC) bands were observed in the water-glass gel of the two tubes. XRF results demonstrated that the DPC bands contained diffusive Co-Fe complexes. XANES results indicated that the Fe and Co local structures in the DPC bands were independent of the initial Fe oxidation states in [Fe(CN)(6)] and the measurement positions. It was found that the Fe local structure of the DPC bands was predominantly [Fe(CN)(6)]. The real-space multiple scattering calculations using FEFF 8.02 code suggested that Co-Fe-based Prussian blue analogs, of which the most likely local structure is Co(OC)(4)(NCFe)(2), co-existed with [Co(H2O)(6)](2+) ions in the DPC bands., CHEMICAL SOC JAPAN
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, Dec. 2016, [Reviewed]

Efficient and Stable Ammonia Synthesis by Self-Organized Flat Ru Nanoparticles on Calcium Amide
Yasunori Inoue; Masaaki Kitano; Kazuhisa Kishida; Hitoshi Abe; Yasuhiro Niwa; Masato Sasase; Yusuke Fujita; Hiroki Ishikawa; Toshiharu Yokoyama; Michikazu Hara; Hideo Hosono, Efficient and stable catalysts for ammonia synthesis under mild conditions are required to meet the strong demand for NH3 as an important precursor chemical and hydrogen carrier. Here we report that during ammonia synthesis, flat-shaped Ru nanoparticles with a narrow distribution (2.1 +/- 1.0 nm) and self-organized on Ca(NH2)(2) exhibit high catalytic performance far exceeding alkali promoted Ru-based catalysts in yield and turnover frequency (TOF). This catalyst enables continuous NH3 production, even at 473 K under ambient pressure. During ammonia synthesis, Ru nanoparticles are distinctly anchored on the surface of Ca(NH2)(2) by strong Ru-N interaction, which leads to the epitaxial growth of Ru on the support surface. The high catalytic performance is due to the formation of high-density flat-shaped Ru nanoparticles and high electron donor ability at the Ru/Ca(NH2)(2) interface. The catalytic stability is significantly improved by Ba-doping of Ca(NH2)(2), and no degradation was observed after ca. 700 h of operation., AMER CHEMICAL SOC
ACS CATALYSIS, Nov. 2016, [Reviewed]

In Situ Observations of Oxygen Evolution Cocatalysts on Photoelectrodes by X-ray Absorption Spectroscopy: Comparison between Cobalt-Phosphate and Cobalt-Borate
Hirokatsu Kurosu; Masaaki Yoshida; Yosuke Mitsutomi; Sho Onishi; Hitoshi Abe; Hiroshi Kondoh, The differing activities of cobalt-phosphate (Co-P-i) and cobalt-borate (Co-B-i) oxygen evolution cocatalysts photodeposited on SrTiO3 photoelectrodes under the same conditions for use in water splitting were investigated using in situ X-ray absorption fine structure (XAFS) spectroscopy. Prior to XAFS analyses, the photoelectrochemical water oxidation activities of both cocatalysts were assessed by linear sweep voltammetry, with results demonstrating that the Co-B-i cocatalyst enhances oxygen evolution to a greater degree than the Co-P-i. Co K-edge XAFS spectra were acquired for both cocatalysts on SrTiO3 photoelectrodes during photoelectrochemical water splitting. The XAFS spectrum of the Co-B-i was significantly more intense than that of the Co-Pi, indicating that a greater concentration of the Co-B-i cocatalyst was present on the photoelectrode compared with the Co-P-i. The results of this study demonstrate that both the Co-P-i and Co-B-i cocatalysts are able to efficiently promote water oxidation, and that the Co-B-i functions more effectively than the Co-P-i because it generates a greater abundance of reaction sites. (C) The Electrochemical Society of Japan, All rights reserved., ELECTROCHEMICAL SOC JAPAN
ELECTROCHEMISTRY, Oct. 2016, [Reviewed]

Observation of surface reduction of NiO to Ni by surface-sensitive total reflection X-ray spectroscopy using Kramers-Kronig relations
Hitoshi Abe; Takeshi Nakayama; Yasuhiro Niwa; Hiroaki Nitani; Hiroshi Kondoh; Masaharu Nomura, We have developed a promising surface-sensitive X-ray absorption fine structure (XAFS) measurement method. This method is based on total reflection detection and Kramers-Kronig relations, and has been named the KK-XAFS method. Total reflection spectra are transformed via Kramers-Kronig relations to obtain XAFS spectra. KK-XAFS experiments give us surface-sensitive structural parameters, while usual EXAFS analyses yield bulk structural parameters. The total reflection spectra themselves are useful for observing and discussing time evolutions of chemical reactions at surfaces by quick scanning measurements. Chemical species are analyzed to estimate their fractions during reactions. The whole method would be named total reflection X-ray spectroscopy (TREXS). A reduction of the NiO layer at the surface of Ni (30 nm)/Si was observed in a laboratory-built TREXS in situ cell. The method would be applicable to observe chemical reactions starting at surfaces and to study their kinetics and mechanisms. (C) 2016 The Japan Society of Applied Physics, IOP PUBLISHING LTD
JAPANESE JOURNAL OF APPLIED PHYSICS, Jun. 2016, [Reviewed]

High Oxidation Tolerance of Ru Nanoparticles on 12CaO center dot 7Al(2)O(3) Electride
Hitoshi Abe; Yasuhiro Niwa; Masaaki Kitano; Yasunori Inoue; Youichi Murakami; Toshiharu Yokoyama; Michikazu Hara; Hideo Hosono, A high tolerance to oxidation of Ru nanoparticles loaded on 12CaO center dot 7Al(2)O(3) (C12A7) was examined by in situ X-ray absorption fine structure (XAFS). Ru nanoparticles on electron-doped C12A7 (C12A7:e(-)) and stoichiometric C12A7 (C12A7:O2-) are robust to oxidation, while those on Al2O3 and on MgO with Cs promoters are easily oxidized. The oxidation tolerance is higher for Ru/C12A7:e(-) than Ru/C12A7:O2-. The main factor of the oxidation tolerance comes from the electron donation property of C12A7:e(-). C12A7:e(-) is an electride in which electrons serve as anions, and these anionic electrons with a low work function (2.4 eV) have a high ability to donate electrons to supporting Ru nanoparticles with a higher work function (4.7 eV). Electron transfer from C12A7:e(-) maintains Ru nanoparticles in the metallic state even under oxidation condition. The Ru catalysts on C12A7:e(-) with high oxidation tolerance can be applied to various catalytic reactions under oxygen-rich conditions, in which conventional catalysts are rapidly oxidized., AMER CHEMICAL SOC
JOURNAL OF PHYSICAL CHEMISTRY C, Apr. 2016, [Reviewed]

Gritty Surface Sample Holder Invented To Obtain Correct X-ray Absorption Fine Structure Spectra for Concentrated Materials by Fluorescence Yield
Hitoshi Abe; Yasuhiro Niwa; Masao Kimura; Youichi Murakami; Toshiharu Yokoyama; Hideo Hosono, A gritty surface sample holder has been invented to obtain correct XAFS spectra for concentrated samples by fluorescence yield (FY). Materials are usually a mixed with boron nitride (BN) to prepare proper concentrations to measure XAFS spectra. Some materials, however, could not be mixed with BN and would be measured in too concentrated conditions to obtain correct XAFS spectra. Consequently, XAFS spectra will be incorrect typically with decreased intensities of the peaks. We have invented the gritty surface sample holders to obtain correct XAFS spectra even for concentrated materials for FY measurements. Pure Cu and CuO powders were measured mounted on the sample holders, and the same spectra were obtained as transmission spectra of properly prepared samples. This sample holder is useful to measure XAFS for any concentrated materials., AMER CHEMICAL SOC
ANALYTICAL CHEMISTRY, Apr. 2016, [Reviewed]

Newly designed double surface bimorph mirror for BL-15A of the Photon Factory
Noriyuki Igarashi; Hiroaki Nitani; Yasuo Takeichi; Yasuhiro Niwa; Hitoshi Abe; Masao Kimura; Takeharu Mori; Yasuko Nagatani; Takashi Kosuge; Ai Kamijo; Atsushi Koyama; Hiromasa Ohta; Nobutaka Shimizu, BL-15A is a new x-ray undulator beamline at the Photon Factory. It will be dedicated to two independent research activities, simultaneous XAFS/XRF/XRD experiments, and SAXS/WAXS/GI-SAXS studies. In order to supply a choice of micro-focus, low-divergence and collimated beams, a double surface bimorph mirror was recently developed. To achieve further mirror surface optimization, the pencil beam scanning method was applied for "in-situ" beam inspection and the Inverse Matrix method was used for determination of optimal voltages on the piezoelectric actuators. The corrected beam profiles at every focal spot gave good agreement with the theoretical values and the resultant beam performance is promising for both techniques. Quick and stable switching between highly focused and intense collimated beams was established using this new mirror with the simple motorized stages., AMER INST PHYSICS
PROCEEDINGS OF THE 12TH INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION (SRI2015), 2016, [Reviewed]

X-ray spectroscopic analysis of Liesegang patterns in Mn-Fe-based Prussian blue analogs
Hisashi Hayashi; Hitoshi Abe, We performed time-resolved X-ray fluorescence (XRF) and position-dependent X-ray absorption near-edge structure (XANES) measurements on gels containing Mn2+ and [Fe(CN)(6)](3-) ions. A sample tube containing an agar gel mixed with 0.20 M MnCl2 solution and a water-glass gel mixed with 0.25 M K-3[Fe(CN)(6)] solution was prepared for these X-ray spectroscopic analyses. Periodic bands that obeyed the empirical scaling laws characteristic of Liesegang bands formed beyond the turbid zone in the water-glass gel. XRF results demonstrated that the turbid zone and the periodic bands contained diffusive Mn and Fe compounds. XANES results indicated that the Fe local structure in the sample tube was nearly independent of positions and was predominantly [Fe(CN)(6)]. In contrast, the Mn local structure depended on the position. FEFF calculations suggested that Mn-Fe-based Prussian blue analogs, of which the most likely local structure is [Mn(NCFe)(3)O3K3], co-existed with [MnO6-nCln] (n = 0, 1) species and that their compositions were position-dependent., ROYAL SOC CHEMISTRY
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, 2016, [Reviewed]

A combined X-ray spectroscopic study on the multicolored pattern formation in gels containing FeCl3 and K-3[Fe(CN)(6)]
Hisashi Hayashi; Hitoshi Abe, We examined the potential of the combined use of two X-ray spectroscopic methods, time-resolved X-ray fluorescence (XRF) spectroscopy and position-dependent X-ray absorption near-edge structure (XANES) spectroscopy, for the study of intricate reaction-diffusion processes of inorganic compounds in gel media. To test this approach, we prepared a glass tube containing agarose gel mixed with FeCl3 solution and water-glass gel mixed with K-3[Fe(CN)(6)] solution and hydrochloric acid. Wide brown and narrow blue bands formed in the water-glass gel, and the full development of the colored patterns took approximately 25 days. XRF and XANES spectroscopies were then used to study the time dependence of the Fe concentration distributions and the microscopic local structures of the Fe species formed in the colored bands, respectively. From these analyses, it was deduced that the brown bands were formed by the stable accumulation of Fe species whose local structure was mainly [Fe(Cl)(2)O-4]; in contrast, the formation of the blue bands (originating from Prussian blue (PB) like compounds) was largely insensitive to both the Fe concentration distribution and the local structure of the dominant Fe species (mainly [Fe(Cl)O-5]) in the bands. Such insensitivities are attributable to the extremely small solubility product of PB (similar to 10(-41)), which allows PB/PB-like compounds to form even under very low concentrations of both Fe2+ and [Fe(CN)(6)](3+). As a result, the brown bands were obscured by the blue colored PB-like compounds when high concentrations of Fe2+, [Fe(CN)(6)](3+), and/or [Fe(CN)(6)](4+) were present, but became visible to reveal multicolored patterns under very low concentrations of these ions., ROYAL SOC CHEMISTRY
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY, 2016, [Reviewed]

Electron Donation Enhanced CO Oxidation over Ru-Loaded 12CaO center dot 7Al(2)O(3) Electride Catalyst
Md Jafar Sharif; Masaaki Kitano; Yasunori Inoue; Yasuhiro Niwa; Hitoshi Abe; Toshiharu Yokoyama; Michikazu Hara; Hideo Hosono, It is widely recognized that CO oxidation effectively proceeds over Au nanopartides supported on a reducible oxide, such as TiO2 and Fe2O3, in which the support supplies oxygen during the reaction (Mars-van Krevelen (MvK) type mechanism). Here we examine the stable electride, [Ca24Al28O64](4+) (e(-))(4) (C12A7:e(-)), with a low work function (2.4 eV), as a Ru catalyst support for CO oxidation. Ru-loaded C12A7:e(-) exhibited more than a 3-fold higher turnover frequency (TOP) and a lower activation energy than Ru-loaded TiO2, Al2O3, and [Ca24Al28O64](4+)(O2-)(2) ( C12A7:O2-) catalysts. The high catalytic performance of Ru/C12A7:e(-) is not due to the MvK type mechanism but to efficient electron transfer from C12A7:e(-) to the species adsorbed on the Ru catalyst, in which the association reaction between adsorbed CO molecules and 0 adatoms is promoted on the Ru surface., AMER CHEMICAL SOC
JOURNAL OF PHYSICAL CHEMISTRY C, May 2015, [Reviewed]

A high-temperature in situ cell with a large solid angle for fluorescence X-ray absorption fine structure measurement
Naoyoshi Murata; Makoto Kobayashi; Yukari Okada; Takuya Suzuki; Hiroaki Nitani; Yasuhiro Niwa; Hitoshi Abe; Takahiro Wada; Shingo Mukai; Hiromitsu Uehara; Hiroko Ariga; Satoru Takakusagi; Kiyotaka Asakura, We present the design and performance of a high-temperature in situ cell with a large solid angle for fluorescence X-ray absorption fine structure (XAFS) spectra. The cell has a large fluorescence XAFS window (116 mm(phi)) near the sample in the cell, realizing a large half-cone angle of 56 degrees. We use a small heater (25 x 35 mm(2)) to heat the sample locally to 873 K. We measured a Pt-SnO2 thin layer on a Si substrate at reaction conditions having a high activity. In situ measurement enables the analysis of the difference XAFS spectra between before and during the reaction to reveal the structure change during the operation. (C) 2015 AIP Publishing LLC., AMER INST PHYSICS
REVIEW OF SCIENTIFIC INSTRUMENTS, Mar. 2015, [Reviewed]

Direct Evidence of Calcium Oxalate Formation in Spinach
Hitoshi Abe, An X-ray absorption fine structure (XAFS) study has been performed to examine the chemical form of Ca in spinach. The spectra obtained by XAFS measurements show direct evidence that Ca exists in the chemical form of calcium oxalate in spinach, which is an insoluble salt. This result can explain the low bioavailability of Ca in spinach. The bioavailability is discussed from the viewpoint of the solubility of calcium oxalate in the stomach., CHEMICAL SOC JAPAN
CHEMISTRY LETTERS, Dec. 2014, [Reviewed]

Photoexcited Hole Transfer to a MnOx Cocatalyst on a SrTiO3 Photoelectrode during Oxygen Evolution Studied by In Situ X-ray Absorption Spectroscopy
Masaaki Yoshida; Takumi Yomogida; Takehiro Mineo; Kiyofumi Nitta; Kazuo Kato; Takuya Masuda; Hiroaki Nitani; Hitoshi Abe; Satoru Takakusagi; Tomoya Uruga; Kiyotaka Asakura; Kohei Uosaki; Hiroshi Kondoh, Photoexcited hole transfer to MnOx cocatalysts on SrTiO3 photoelectrodes was examined under controlled potential conditions during UV irradiation using in situ Mn K-edge X-ray absorption fine structure (XAFS) spectroscopy. The absorption edges of spectra were found to shift to higher energies during irradiation, indicating that MnOx cocatalysts were oxidized by the migration of photoexcited holes accompanied by a positive potential shift of the MnOx cocatalysts. This oxidation process was promoted by the application of a positive applied potential, suggesting that the photoexcited hole transfer was enhanced by upward band bending at the cocatalystphotoelectrode interface. Structural changes of the MnOx cocatalyst were found to depend on the UV photon intensity; thus, the observations of photoexcited electron transfer by XAFS are associated with the photoelectrochemical activity during water splitting., AMER CHEMICAL SOC
JOURNAL OF PHYSICAL CHEMISTRY C, Oct. 2014, [Reviewed]

PF BL-15A for semi-microbeam XAFS/XRF and high-brilliance SAXS/GI-SAXS
Noriyuki Igarashi; Atsushi Koyama; Takeharu Mori; Ai Kamijo; Hiromasa Ohta; Hiroaki Nitani; Yasuhiro Niwa; Hitoshi Abe; Nobutaka Shimizu, New beamline, BL-15A, was completed at the BL-15 section of the PF-ring in 2014. This new beamline has a short gap undulator which produces high brilliance X-rays ranging from 2.1 keV to 15 keV. The beamline will be dedicated to both activities, XAFS/XRF/XRD studies using semi-micro focus beams (A1 station) and SAXS experiments using collimated softer and hard X-rays (A2 station). In the XAFS/XRF studies, the semi-micro beam available in a wide range of photon energies allows analyzing the local structures of the elements and valence on inhomogeneous samples in the fields of environmental science and new energy source science. The softer X-rays up to 2.1 keV will provide access to absorption edges of phosphor and sulfur, which are very important targets for those fields. The SAXS scientific programs include structural studies of functional membranes, time-resolved X-ray scattering and large hierarchical structure analysis. All of these three programs require a high-brilliance light source. In particular, grazing incidence SAXS (GI-SAXS) using vertically small-size softer beam ranging between 2.1-3.0 keV will help to control the depth of the membrane structure analysis and reduce the roughness defects of an imperfect membrane. The combination of XAFS/XRF and SAXS experiments gives wide structural information from fine atomic structure to low and medium resolution. It can be beneficial to build these instruments as two stations on the same beamline. BL-15A is oriented toward joint advanced studies by the two techniques. Old BL-15 beamlines were scrapped and new construction work started in 2013. The construction was completed in the summer shutdown of 2013 and the first beams was delivered on Oct 17, 2013. We are pursuing the beamline commissioning and the A1 and A2 stations will be opened to users in May, 2014. Here, the beamline design and performance, and the preliminary results will be reported., International Union of Crystallography (IUCr)
Acta Crystallographica Section A Foundations and Advances, 05 Aug. 2014

Structures of Fe Magnetic Ultrathin Films on Cu(001) Before and After CO Adsorption Revealed by EXAFS
Hitoshi Abe; Masako Sakamaki; Kenta Amemiya, The structures of the Fe(2 and 4 ML)/Cu(001) films before and after CO adsorption are revealed by EXAFS. The Fe(2 ML)/Cu(001) film shows an fcc structure before and after CO adsorption. The bare Fe(4 ML)/Cu(001) film also have an fcc structure. However, the CO adsorbed Fe(4 ML)/Cu(001) film changes its structure to the mixture of fcc and strained bcc structures. The strained bcc structure is closely examined, and the shear angle of 10 degrees is most plausible. The relationship between the structure and magnetism has been discussed. The magnetically dead layers have been reported for the CO/Fe(4 ML)/Cu(001) film, and it is concluded that the dead layers correspond to this strained bcc structure., PHYSICAL SOC JAPAN
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, Aug. 2014, [Reviewed]

Electrochromic Characteristics of a Nickel Borate Thin Film Investigated by In Situ XAFS and UV/vis Spectroscopy
Masaaki Yoshida; Tsuyoshi Iida; Takehiro Mineo; Takumi Yomogida; Kiyofumi Nitta; Kazuo Kato; Hiroaki Nitani; Hitoshi Abe; Tomoya Uruga; Hiroshi Kondoh, The electrochromic transition of a nickel borate thin film between colorless and brown was examined by means of in situ XAFS and UV/vis spectroscopy. The XAFS spectra showed that the average valence state of the nickel species in the film changed from +2.1 to +3.8 following the application of an electrode potential. Additionally, a broad peak at 700 nm was observed during in situ UV/vis absorption measurements on the application of a positive potential. These results suggest that the nickel borate film reversibly forms a NiOOH structure with a domain size of several nanometers during the electrochromic reaction. (c) The Electrochemical Society of Japan, All rights reserved., ELECTROCHEMICAL SOC JAPAN
ELECTROCHEMISTRY, May 2014, [Reviewed]

Observation of Photoexcited Carrier Transfer in MnOx/SrTiO3 Photoelectrode by In Situ X-ray Absorption Fine Structure　　　　　　　　　　　　　　　
Masaaki Yoshida; Takumi YOMOGIDA; Takehiro MINEO; Kiyofumi NITTA; Kazuo KATO; Takuya MASUDA; Hiroaki NITANI; Hitoshi Abe; Satoru TAKAKUSAGI; Tomoya URUGA; Kiyotaka ASAKURA; Kohei UOSAKI; Hiroshi KONDOH
225th ECS Meeting, Mar. 2014, [Reviewed]

In situ back-side illumination fluorescence XAFS (BI-FXAFS) studies on platinum nanoparticles deposited on a HOPG surface as a model fuel cell: a new approach to the Pt-HOPG electrode/electrolyte interface
Hiromitsu Uehara; Yohei Uemura; Takafumi Ogawa; Kentaro Kono; Ryoichi Ueno; Yasuhiro Niwa; Hiroaki Nitani; Hitoshi Abe; Satoru Takakusagi; Masaharu Nomura; Yasuhiro Iwasawa; Kiyotaka Asakura, We measured the in situ polarization-dependent X-ray absorption fine structure of platinum nanoparticles (PtNPs) deposited on a flat highly oriented pyrolytic graphite (HOPG) substrate under electrochemical conditions using a back-side illumination method. In this method, the thin HOPG substrate with PtNPs deposited on one side was used as a window for incident and fluorescent X-rays, as well as an electrode. A bent crystal Laue analyzer (BCLA) was applied to the extraction of the Pt L-alpha fluorescent X-ray signals from strong scattered X-rays. Pt L-3 edge XAFS spectra were observed for various electrode potentials and polarization directions., ROYAL SOC CHEMISTRY
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2014, [Reviewed]

Development of surface sensitive DXAFS measurement method by applying Kramers-Kronig relations to total reflection spectra
Hitoshi Abe; Yasuhiro Niwa; Hiroaki Nitani; Masaharu Nomura, Total reflection XAFS spectra are obtained combining with dispersive XAFS (DXAFS) configuration. A total reflection DXAFS spectrum of 30 nm Co layer on Si substrate was measured in 4 ms. Kramers-Kronig analysis was applied to extract XAFS signal from total reflection spectra. Spectra obtained by this method are comparable to usual XAFS spectra in terms of signal-to-noise ratios and peak positions in Fourier transformed EXAFS functions. The development of this Kramers-Kronig relations based DXAFS method is useful to study the variation of the surface state with the time resolution of millisecond., IOP PUBLISHING LTD
1ST CONFERENCE ON LIGHT AND PARTICLE BEAMS IN MATERIALS SCIENCE 2013 (LPBMS2013), 2014, [Reviewed]

In situ observation of carrier transfer in the Mn-oxide/Nb:SrTiO3 photoelectrode by X-ray absorption spectroscopy
Masaaki Yoshida; Takumi Yomogida; Takehiro Mineo; Kiyofumi Nitta; Kazuo Kato; Takuya Masuda; Hiroaki Nitani; Hitoshi Abe; Satoru Takakusagi; Tomoya Uruga; Kiyotaka Asakura; Kohei Uosaki; Hiroshi Kondoh, The Mn-oxide/Nb:SrTiO3 photoelectrode for oxygen evolution reaction was investigated by in situ Mn K-edge XAFS spectroscopy under UV irradiation. The oxidization of the Mn oxide was observed via photoexcited carrier transfer, which results in the positive potential shift of the Mn oxide cocatalyst toward oxygen evolution reaction., ROYAL SOC CHEMISTRY
CHEMICAL COMMUNICATIONS, 2013, [Reviewed]

New high-brilliance beamline BL-15A of the Photon Factory
N. Igarashi; N. Shimizu; A. Koyama; T. Mori; H. Ohta; Y. Niwa; H. Nitani; H. Abe; M. Nomura; T. Shioya; K. Tsuchiya; K. Ito, Here we describe a new undulator beamline at the BL-15 site of the PF-ring. This new beamline has a short gap undulator which produces high brilliance X-rays ranging from 2.1 keV to 15 keV. The windowless beamline design promises softer X-ray experiments. The second source configuration and double surface bimorph mirror directs the highly focused or collimated radiation to two tandem stations. The upstream station is optimized for XAFS/XRF/XRD studies using a semi-micro focus beam. The downstream station features SAXS experiments using collimated soft or hard X-rays. A novel feature of the beamline is real-time energy synchronization with the undulator gap motion, which is critical for quick energy scanning. The beamline design has been finished and the construction work will start next spring. The construction will be completed during the summer shutdown of 2013, and the new BL-15A will be opened to users in the autumn operation of 2013., IOP PUBLISHING LTD
11TH INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION (SRI 2012), 2013, [Reviewed]

In Situ Ambient Pressure XPS Study of CO Oxidation Reaction on Pd(111) Surfaces
Ryo Toyoshima; Masaaki Yoshida; Yuji Monya; Yuka Kousa; Kazuma Suzuki; Hitoshi Abe; Bongjin Simon Mun; Kazuhiko Mase; Kenta Amemiya; Hiroshi Kondoh, The CO oxidation reaction on the Pd(111) model catalyst at various temperatures (200-400 degrees C) under hundreds mTorr pressure conditions has been monitored by in situ ambient pressure X-ray photoelectron spectroscopy and mass spectroscopy. In situ observation of the reaction revealed that the Pd(111) surface is covered by CO molecules at a lower temperature (200 degrees C), while at higher temperatures (300-400 degrees C) several oxide phases are formed on the surface. We found that the reactivity is enhanced in the presence of a surface oxide and significantly suppressed by formation of a cluster oxide and the PdO bulk oxide. CO titration experiments suggest that less coordinated oxygen atoms are more reactive for CO oxidation., AMER CHEMICAL SOC
JOURNAL OF PHYSICAL CHEMISTRY C, Sep. 2012, [Reviewed]

Real-time observation of CO oxidation reaction on Ir(111) surface at 33 ms resolution by means of wavelength-dispersive near-edge x-ray absorption fine structure spectroscopy
Kenta Amemiya; Yuka Kousa; Shuichi Nakamoto; Taiga Harada; Shogo Kozai; Masaaki Yoshida; Hitoshi Abe; Ryohei Sumii; Masako Sakamaki; Hiroshi Kondoh, The CO oxidation reaction on Ir(111) is observed by the near-edge x-ray absorption fine structure (NEXAFS) spectroscopy in the soft x-ray region. A continuous data acquisition at 33 ms real-time resolution is realized for a single event of the reaction without the repetition, by adopting the wavelength-dispersive NEXAFS technique. The time evolution of the coverages for atomic O and molecular CO is quantitatively estimated during the reaction. The obtained activation energy is significantly larger than that on Pt(111). (C) 2011 American Institute of Physics. [doi:10.1063/1.3624587], AMER INST PHYSICS
APPLIED PHYSICS LETTERS, Aug. 2011, [Reviewed]

Irreversible Change in the NO Adsorption State on Pt(111) under High Pressure Studied by AP-XPS, NEXAFS, and STM
Toru Shimada; Bongjin Simon Mun; Ikuyo F. Nakai; Atsushi Banno; Hitoshi Abe; Yasuhiro Iwasawa; Toshiaki Ohta; Hiroshi Kondoh, Ambient pressure X-ray photoelectron spectroscopy (AP-XPS) has been applied to the investigation of NO adsorption on Pt(111) under various pressures of NO (up to 1 Torr) at room temperature. Under 10(-7) Torr, molecular NO occupies the most stable fcc-hollow sites and partially occupies the energetically unfavorable atop sites. NO reversibly desorbs from the atop sites after evacuation. At NO pressures higher than 10(-6) Torr. however, irreversible adsorption or atomic oxygen takes place via NO dissociation, leading to the formation of NO+C) domains. This result is consistent with near-edge X-ray absorption fine structure (NIHXAFS) and scanning tunneling microscopy (STM) results., AMER CHEMICAL SOC
JOURNAL OF PHYSICAL CHEMISTRY C, Oct. 2010

Magnetic and Film Structures of NO, CO Adsorbed Fe/Cu(001)
H. Abe; K. Amemiya; M. Sakamaki; Y. Kousa; S. Kouzai; H. Kondoh
Hyomen Kagaku (Journal of The Surface Science Society of Japan), 2010

Perpendicular magnetic anisotropy associated with strain relaxation in Ru/Co/Ru(0001): Anomalous relation of atomic and magnetic structures
J. Miyawaki; D. Matsumura; H. Abe; T. Ohtsuki; E. Sakai; K. Amemiya; T. Ohta, Atomic structure and magnetic anisotropy of Ru/Co/Ru(0001) were studied by Co K-edge extended x-ray absorption fine structure and Co L(III,II)-edge x-ray magnetic circular dichroism. The Co/Ru(0001) films exhibit in-plane magnetization in a thickness range of 1-15 ML. The Co film shows a large expansion of the in-plane Co-Co bond length at the initial stage of the growth, leading to a large strain. Upon Ru capping on the Co/Ru(0001) film, the strain is relaxed and a spin reorientation transition (SRT) occurs from in-plane to out-of-plane magnetization. These results contradict the conventional understanding of magnetic anisotropy in which perpendicular magnetic anisotropy (PMA) is believed to be enhanced by the strain in the film. The estimation of magnetic anisotropy constants revealed that the SRT is induced by a large PMA at the Co/Ru interface in the Ru capped films, as well as a large in-plane magnetic anisotropy at the vacuum/Co and/or Co/Ru interfaces in the Co bare films., AMER PHYSICAL SOC
PHYSICAL REVIEW B, Jul. 2009

Surface antiferromagnetic coupling of Fe/Cu(001) induced by NO adsorpion studied by means of depth-resolved XMCD method
Hitoshi Abe; Masako Sakamaki; Kenta Amemiya, Effects of NO adsorption on the magnetism of Fe(2 and 4 ML)/Cu(001) films have been studied. XMCD spectra have been measured for the films before and after NO adsorption. The bare 4 ML Fe film is magnetized perpendicularly, and m(s)(eff) is 2.5 mu B. However, the NO adsorbed 4 ML Fe film exhibits in- plane magnetization and shows m(s)(eff) of 1.2 mu B, which is about a half of m(s)(eff) of the bare film. The apparent fifty percent reduction of ms eff can be attributed to an idea that m(s)(eff) of 1 ML aligns in the opposite direction to that of the other 3 MLs'. This antiferromagnetic coupling between the topmost layer and the other layers is suggested by the careful analyses of the depth resolved XMCD spectra., IOP PUBLISHING LTD
14TH INTERNATIONAL CONFERENCE ON X-RAY ABSORPTION FINE STRUCTURE (XAFS14), PROCEEDINGS, 2009

Depth profiling of magnetic and atomic structures of ultrathin films by depth-resolved XMCD and XAFS techniques with a sub-nm depth resolution
K. Amemiya; J. Miyawaki; H. Abe; E. O. Sako; M. Sakamaki, Recent progresses in the depth-resolved X-ray magnetic circular dichroism (XMCD) and X-ray absorption fine structure (XAFS) techniques are presented. The depth-resolved atomic and magnetic structures of Co films grown on Ru(0001) was investigated by using the depth-resolved XMCD and extended X-ray absorption fine structure EXAFS. The threedimensional magnetic structure of a micro-patterned Fe/Ni/Cu(100) film was studied by combining the depth-resolved XMCD with the X-ray microbeam. The technique was also applied to Co thin films covered with a relatively thick Mo overlayer, in order to demonstrate the possibility to investigate ex-situ samples with a protection layer., IOP PUBLISHING LTD
14TH INTERNATIONAL CONFERENCE ON X-RAY ABSORPTION FINE STRUCTURE (XAFS14), PROCEEDINGS, 2009

Multiple-scattering approach to Ti L-2,L-3-edge XMCD analyses for Co doped TiO2
Takashi Maruyama; Takumi Ohtsuki; Enju Sakai; Hitoshi Abe; Toshihiro Shimada; Tetsuya Hasegawa; Shin-ichi Nagamatsu; Takashi Fujikawa, We have measured Ti L-2,L-3-edge X-ray magnetic circular dichroism (XMCD) spectra of Co doped anatase TiO2 (Co0.05Ti0.95O2), where nonzero XMCD spectra have been observed even at Ti L-2,L-3-edge. In order to understand the reason why the XMCD signals are observed at Ti L-2,L-3-edge, we have applied the relativistic multiple-scattering approach to the analyses of the observed XMCD spectra. The results show that the Ti L-2,L-3-edge XMCD spectra are dominated by the spin-dependent exchange scatterings on the spin-polarized Co sites. We find a good agreement with the observed L-3 XMCD spectra. The calculated XMCD spectra are rather sensitive to the spin moment on the X-ray absorbing Ti. We conclude that the spin moment on Ti site is very small and antiparallel to that on Co. The calculated results also show that the observed Ti L-2,L-3-edge XMCD signals arise from the Ti atoms within about 4 A from spin-polarized Co atoms., IOP PUBLISHING LTD
14TH INTERNATIONAL CONFERENCE ON X-RAY ABSORPTION FINE STRUCTURE (XAFS14), PROCEEDINGS, 2009

Modification of Surface Magnetism by Molecular Adsorption on Magnetic Thin Films
H. Abe; K. Amemiya; T. Ohta, Molecular adsorptions affect on the magnetism of magnetic thin films. We have observed anomalous magnetic states in gas adsorbed Fe thin films. In this report, we present the CO or NO adsorption effects on the magnetism of 2-4 ML Fe thin films on Cu(001), which are typical magnetic thin films. The Fe(2 ML)/Cu(001) film does not change its magnetic structure upon CO adsorption, whereas the CO/Fe(3 and 4 ML)/Cu(001) films turned their easy axes of magnetization to in plane. Depth resolved XMCD measurements give us detailed information on the depth profile of the magnetic structures. The surface two layers of the CO/Fe(4 ML)/Cu(001) film lose the magnetization, and only the bottom two layers keep the magnetization. NO adsorbed Fe films have the in-plane easy axes of magnetization. Moreover, the magnetization of the topmost layer of the NO/Fe/Cu(001) films aligns in the opposite direction to the other layers. Thus, the antiferromagnetism in the surface layers has appeared in the NO/Fe/Cu(001) films., The Surface Science Society of Japan
Hyomen Kagaku, 2009

Depth-Resolved XMCD Study of Ultrathin Mo/Co/Au Films
M. Sakamaki; H. Abe; R. Sumii; K. Amemiya; T. Konishi; T. Fujikawa; L. T. Baczewski; A. Wawro; A. Petroutchik; Z. Kurant; A. Maziewski, The effect of Mo overlayer on the magnetism of ultrathin Co films grown on Au(111) was studied. The structure and magnetism at the Mo/Co interface were studied by means of depth-resolved X-ray magnetic circular dichroism. The magnetic moment of Co near the Mo/Co interface was reduced in comparison to the inner part of the film for the samples which have in-plane anisotropy. This effect is more prominent in the case of Mo overlayer with higher roughness, and can be attributed to Co-Mo intermixing at the interface., POLISH ACAD SCIENCES INST PHYSICS
ACTA PHYSICA POLONICA A, Jan. 2009

CO adsorption effects on the magnetism and surface structure of Fe/Cu(001)
Hitoshi Abe; Kenta Amemiya; Jun Miyawaki; Erika O. Sako; Masako Sakamaki; Daiju Matsumura; Takumi Ohtsuki; Enju Sakai; Toshiaki Ohta, Effects of CO adsorption on the magnetic properties of Fe films on Cu(001) were studied at 100 K as a function of the film thickness. CO adsorption does not affect the magnetic property of 2 ML Fe film but induces the spin reorientation transition from perpendicular to in-plane magnetization for 4 ML Fe film. It also causes the apparent decrease of magnetization, which is attributed to the reduction in surface magnetization by analyses of depth-resolved XMCD spectra. The reduction of the magnetization can be originated from a reconstruction of the surface structure of the films. It was suggested that the surface structures of the 4 ML Fe film are changed to a bcc-like structure upon CO adsorption, while the structure of the 2 ML Fe film could not change by CO adsorption because its magnetization is unchanged. © 2008 The Surface Science Society of Japan.
e-Journal of Surface Science and Nanotechnology, 13 Nov. 2008

Huge perpendicular magnetic anisotropy of Fe single layer and spin-reorientation transitions observed in Fe/Co/Pd(111) films
H. Abe; J. Miyawaki; E. O. Sako; M. Sakamaki; K. Amemiya, The spin-reorientation transition (SRT) of Co/Pd(111) induced by Fe deposition was investigated using the x-ray magnetic circular dichroism method. In-plane magnetized 4-6 monolayer (ML) Co films undergo the SRT twice. First, a small amount of Fe deposition causes a transition to perpendicular magnetization; second, further Fe deposition (1-2 ML in total) causes a return to in-plane magnetization. A perpendicularly magnetized 3 ML Co film also exhibits a transition to in-plane magnetization by 1.5-2 ML Fe deposition. A precise magnetic anisotropy phase diagram was obtained using a combination of wedge-shaped Co samples with stepwise Fe deposition. Large perpendicular magnetic anisotropy was observed in a single layer Fe on Co/Pd(111)., AMER PHYSICAL SOC
PHYSICAL REVIEW B, Jul. 2008

Magnetization process of Co/Pd(111) thin films: Chemisorption-induced spin-reorientation transition
Daiju Matsumura; Takeshi Nakagawa; Hirokazu Watanabe; Hitoshi Abe; Kenta Arnemiya; Toshiaki Ohta; Toshihiko Yokoyama, Spin-reorientation transitions of Co/Pd(111) magnetic thin films induced by chemisorption of molecules have been investigated by the magneto-optical Kerr effect. The magnetic hysteresis curves during the phase transitions induced by CO adsorption were recorded with the polar and longitudinal Kerr geometries. Essential differences in the variations of the coercive field and the remanent magnetization were observed between the in-plane and perpendicular magnetization processes. It was found that the larger the area of perpendicular magnetization is, the larger the perpendicular coercive field becomes. On the contrary, as the area of in-plane magnetization is smaller, the in-plane coercive field becomes larger, although the enhancement is much less significant than in the perpendicular case. This difference is explained in terms of the different character of domain walls. NO adsorption has also been investigated. Similarities and dissimilarities between CO and NO adsorption indicate that NO stabilizes perpendicular magnetization even from the initial stage of adsorption, while the stabilization of perpendicular magnetization by CO adsorption occurs only at the second stage where the atop-site adsorption is completed and the bridge-site adsorption starts. (c) 2008 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
SURFACE SCIENCE, Jun. 2008

Anomalous magnetic phases in Fe/Cu (001) ultrathin films induced by CO adsorption
H. Abe; K. Amemiya; D. Matsumura; J. Miyawaki; E. O. Sako; T. Ohtsuki; E. Sakai; T. Ohta, Effects of CO adsorption on the magnetic properties of Fe films on Cu(001) were studied at 100 K as a function of the film thickness. CO adsorption does not affect the magnetic property of 2 ML Fe film but induces the spin reorientation from out-of-plane to in-plane magnetization for 3 and 4 ML films. It also causes the decrease of magnetization, which can be attributed to the reduction in surface magnetization. Fe films of 6 and 8 ML lose their magnetization by CO adsorption. Possible interpretations for these complicated magnetic behaviors are discussed. © 2008 The American Physical Society.
Physical Review B - Condensed Matter and Materials Physics, 07 Feb. 2008

Anomalous magnetic phases in Fe/Cu(001) ultrathin films induced by CO adsorption
H. Abe; K. Amemiya; D. Matsumura; J. Miyawaki; E. O. Sako; T. Ohtsuki; E. Sakai; T. Ohta, Effects of CO adsorption on the magnetic properties of Fe films on Cu(001) were studied at 100 K as a function of the film thickness. CO adsorption does not affect the magnetic property of 2 ML Fe film but induces the spin reorientation from out-of-plane to in-plane magnetization for 3 and 4 ML films. It also causes the decrease of magnetization, which can be attributed to the reduction in surface magnetization. Fe films of 6 and 8 ML lose their magnetization by CO adsorption. Possible interpretations for these complicated magnetic behaviors are discussed., AMER PHYSICAL SOC
PHYSICAL REVIEW B, Feb. 2008, [Reviewed]

CO吸着によって生じるFe/Cu(001)薄膜の新たな磁気状態　　　　　　　　　　　　　　　
阿部仁; 雨宮健太; 太田俊明
Photon Factory News, 2008

CO adsorption induced anomalous magnetic phases in Fe/Cu(001) films　　　　　　　　　　　　　　　
H. Abe; K. Amemiya; T. Ohta
Photon Factory News, 2008

Two-step Kirkpatrick-Baez system: Compact optics for X-ray microfocusing
Kenta Amemiya; Erika O. Sako; Jun Miyawaki; Hitoshi Abe, A design concept is presented for a compact X-ray microfocusing system, which consists of two sets of Kirkpatrick-Baez (K-B) optics and intermediate slits. The proposed optics enables us to achieve a high demagnification factor, while the total length of the optics is relatively small. Ray-tracing simulations demonstrate that a spot size comparable to that of a conventional K-B optics is achieved using the two-step K-B microfocusing system with much shorter optics, keeping the same working distance. Preliminary results from a prototype system are also reported. A 3.3 mu m spot was obtained after a proper alignment, which agrees well with the expected spot size., INST PURE APPLIED PHYSICS
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, Jun. 2007

Spin reorientation transition in ultrathin Co films on Ru(0001) induced by Ru capping
J. Miyawaki; D. Matsumura; H. Abe; T. Otsuki; E. Sakai; K. Amemiya; T. Ohta, The magnetic anisotropy of the Co thin films on Ru(0001) and the effect of the Ru capping were studied by Co L-III,L-II-edge x-ray magnetic circular dichroism (XMCD). As-deposited Co films show only surface parallel magnetization in the whole thickness range of the observation (1-15 monolayer), while a Ru capping on 1-6 ML Co/Ru(0001) causes a spin reorientation transition (SRT) from surface parallel to the perpendicular magnetization. The critical thickness of SRT by the Ru capping is similar to 6 ML. The Ru capping causes the reduction of the parallel orbital magnetic moments and contributes to stabilize perpendicular magnetic anisotropy., AMER INST PHYSICS
X-RAY ABSORPTION FINE STRUCTURE-XAFS13, 2007

Depth-resolved XMCD application to Fe/Ni/Cu(001) films
Hitoshi Abe; Kenta Amemiya; Daiju Matsumura; Takumi Ohtsuki; Enju Sakai; Toshihiko Yokoyama; Toshiaki Ohta, Spin reorientation transitions (SRTs) of Ni/Cu(001) induced by Fe depositions were investigated using x-ray magnetic circular dichroism (XMCD) method. In-plane magnetized Ni films (< 9 ML) exhibited the SRT twice; first, a small deposition (< 1 NIL) of Fe caused a transition to perpendicular magnetization. Second, further Fe deposition (I to 2 NIL in total) caused a return to in-plane magnetization. Perpendicularly magnetized Ni films (> 10 TAL) also exhibited a transition to in-plane by I to 2 NE Fe deposition. The Fe orbital to spin magnetic moment ratio in 2 NE were investigated with the depth-resolved XMCD technique, leading to the results that the top layer had a large orbital to spin magnetic moment ratio for perpendicular direction, while the bottom layer had a large orbital to spin magnetic moment ratio for in-plane direction. Magnetic anisotropy energies of Fe were determined in the depth-resolved way from the moment analyses. The mechanisms of the SRTs were successfully explained by the obtained magnetic anisotropy energies., AMER INST PHYSICS
X-RAY ABSORPTION FINE STRUCTURE-XAFS13, 2007

Design concept for a high-resolution variable included angle grazing incidence monochromator with a varied line spacing grating and a new optics for microfocusing
Kenta Amemiya; Hitoshi Abe; Jun Miyawaki; Erika O. Sako; Toshiaki Ohta, A novel design concept for a variable included angle Monk-Gillieson mounting monochromator with a varied fine spacing grating is presented and the energy resolution is estimated by using the ray-tracing method. It is indicated that relatively high resolution is achieved even if one scans the photon energy with a fixed included angle. A novel microfocusing system, two-step Kirkpatric-Baez optics, is also proposed. The ray tracing results indicate that a submicron spot size in FWHM is achieved by focusing mirrors with commercially available slope errors at a relatively long working distance. Preliminary results from a prototype system for microfocusing are demonstrated, which shows that a spot size of several pm can be achieved by using cylindrical mirrors only., AMER INST PHYSICS
SYNCHROTRON RADIATION INSTRUMENTATION, PTS 1 AND 2, 2007

Spin reorientation transitions of Fe/Ni/Cu(001) studied by using the depth-resolved X-ray magnetic circular dichroism technique
H Abe; K Amemiya; D Matsumura; S Kitagawa; H Watanabe; T Yokoyama; T Ohta, The spin reorientation transition (SRT) of Ni/Cu(001) induced by Fe deposition was investigated using the X-ray magnetic circular dichroism (XMCD) method. In-plane magnetized Ni films (<= 9 ML) undergo the SRT twice; first, a small amount (< 1 ML) of Fe deposition causes a transition to perpendicular magnetization. Second, further Fe deposition (1-2 ML in total) causes a return to in-plane magnetization. Perpendicularly magnetized Ni films (>= 10 ML) also exhibit a transition to in-plane by 1-2 ML Fe deposition. A precise magnetic anisotropy phase diagram was obtained using a combination of wedge-shaped Ni samples and stepwise Fe deposition. Magnetic anisotropy energies in the bulk, surface and interface layers of Ni films were separately determined using the depth-resolved XMCD technique, while values in the 1 ML and 2 ML portions of the Fe films were obtained from the conventional XMCD measurements. The origin of the SRTs is successfully explained with a simple phenomenological layer model using the obtained magnetic anisotropy energies. (c) 2005 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Jul. 2006

Surface structure of CO on Co/Pd(111) magnetic thin films and its effect on the spin reorientation transition of the film
D Matsumura; K Amemiya; S Kitagawa; T Shimada; H Abe; T Ohta; H Watanabe; T Yokoyama, The CO surface structures on Co/Pd(111) magnetic thin film and the chemisorption-driven spin reorientation transition have been studied by soft x-ray spectroscopies. C 1s photoelectron diffraction for CO/Co/Pd(111) revealed that CO is adsorbed both on the atop and bridge sites at 200 K, while CO is adsorbed exclusively on the atop site at 300 K. From simultaneous measurement of C 1s photoelectron spectroscopy and Co L-edge x-ray magnetic circular dichroism during stepwise CO adsorption and annealing, it was concluded that the spin reorientation transition is induced not by a thermodynamical effect but by the CO adsorption on the bridge site. These results show that the adsorption structure has a significant effect on the surface magnetic anisotropy of the thin film., AMERICAN PHYSICAL SOC
PHYSICAL REVIEW B, May 2006

Anomalous behavior of satellite features at the surface and interface in the Ni L-edge x-ray absorption spectra
K Amemiya; E Sakai; D Matsumura; H Abe; T Ohta, The behavior of satellite features appearing in the Ni L-edge x-ray absorption spectrum has been investigated for Cu-capped Ni films on Cu(100) by extracting the interface component of the absorption spectrum. By comparing the results with the surface component, it was revealed that the satellite feature at similar to 6 eV above the L-III peak is suppressed only at the surface. This behavior was well reproduced by a one-electron multiple-scattering calculation. On the other hand, an enhancement in the 3-eV satellite was observed at the surface, associated with an increase in the d-hole number. This is interpreted as an increase in the 3d(8) configuration in the ground state., AMERICAN PHYSICAL SOC
PHYSICAL REVIEW B, Nov. 2005

Spin-reorientation transition of Ni/Cu(100) and CO/Ni/Cu(100): Separation of the surface and bulk components of the X-ray magnetic circular dichroism spectrum
K Amemiya; E Sakai; D Matsumura; H Abe; T Ohta; T Yokoyama, The spin-reorientation transition of Ni/Cu(100) and CO/Ni/Cu(100) films was investigated with the depth-resolved x-ray magnetic circular dichroism (XMCD) technique. The XMCD spectra from the surface and inner layers were separately extracted. As for the bare Ni films, the in-plane orbital magnetic moment in the surface layer is significantly enhanced. In contrast, the inner layers exhibit larger perpendicular orbital magnetic moment than the in-plane one. Upon CO adsorption, the surface magnetization is drastically reduced, while the inner layers are unaffected. These results directly explain the spin-reorientation transition in Ni/Cu(100) and CO/Ni/Cu(100)., AMERICAN PHYSICAL SOC
PHYSICAL REVIEW B, Jun. 2005

Direct observation of surface and interface magnetism with the probing depth-dependent X-ray magnetic circular dichroism technique
K Amemiya; D Matsumura; H Abe; S Kitagawa; T Yokoyama; T Ohta, Surface and interface magnetization of Fe/Ni/Cu(1 0 0) thin films was observed with the probing depth-dependent X-ray magnetic circular dichroism technique, in which the probing depth is controlled by changing the electron detection angle. An oscillatory behaviour of the surface magnetization dependent on the Fe thickness was directly revealed, while simple analyses indicated that the interface (bottom) Fe magnetization stays almost unchanged independent of the Fe thickness, and that the inner layers are basically nonmagnetic. These results suggest an oscillatory interlayer magnetic coupling between the surface and interface of the Fe film via the nonmagnetic inner layers. It was indicated that the observed oscillation can also be attributed to a rotatory interlayer coupling between the surface and interface. A temperature-dependent experiment indicated that the surface magnetization is reversed depending on the temperature, which might be attributed to the magnetic structural change in the inner layers. (c) 2005 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, Jun. 2005

Direct observation of magnetic depth profile with a depth-resolved x-ray magnetic dichroism technique
K. Amemiya; S. Kitagawa; T. Yokoyama; D. Matsumura; H. Abe; H. Watanabe; T. Ohta, We have established a high-precision depth-resolved X-ray magnetic circular dichroism (XMCD) technique, in which the probing depth of the partial electron yield XMCD spectra is controlled by changing the detection angle of the emitted electrons. The data quality has been significantly improved by using an imaging-type microchannel plate detector. We applied this new technique to Fe ultrathin films grown on Cu(100), and directly confirmed that the surface two layers of the 7 ML Fe film are ferromagnetically coupled, while the inner layers are in the spin density wave (SDW) state at 130 K. Then we separately extracted the XMCD spectra for the surface ferromagnetic (FM) and inner SDW layers. It was indicated that the SDW magnitude is almost the same as the magnetic moment of the surface FM layers, and that the orbital moment of the surface layers is larger than that of the SDW ones. Moreover, the extracted spectrum for the SDW layers exhibited a bulk-like feature, while the surface spectrum was similar to that from the 2 ML film, in which no bulk component should be included., IOP PUBLISHING LTD
PHYSICA SCRIPTA, 2005

Direct observation of magnetic depth profile with a depth-resolved x-ray magnetic dichroism technique
K. Amemiya; S. Kitagawa; T. Yokoyama; D. Matsumura; H. Abe; H. Watanabe; T. Ohta, We have established a high-precision depth-resolved x-ray magnetic circular dichroism (XMCD) technique, in which the probing depth of the partial electron yield XMCD spectra is controlled by changing the detection angle of the emitted electrons. The data quality has been significantly improved by using an imaging-type microchannel plate detector. We applied this new technique to Fe ultrathin films grown on Cu(100), and directly confirmed that the surface two layers of the 7?ML Fe film are ferromagnetically coupled, while the inner layers are in the spin density wave (SDW) state at 130?K. Then we separately extracted the XMCD spectra for the surface ferromagnetic (FM) and inner SDW layers. It was indicated that the SDW magnitude is almost the same as the magnetic moment of the surface FM layers, and that the orbital moment of the surface layers is larger than that of the SDW ones. Moreover, the extracted spectrum for the SDW layers exhibited a bulk-like feature, while the surface spectrum was similar to that from the 2?ML film, in which no bulk component should be included. © Physica Scripta 2005.
Physica Scripta T, 2005, [Reviewed]

Direct observation of oscillatory behavior in the surface magnetization of Fe thin films grown on a Ni/Cu(100) film
K Amemiya; D Matsumura; H Abe; S Kitagawa; T Ohta; T Yokoyama, The surface and interface magnetic structures of Fe thin films (4-11 ML) grown on a 6 ML Ni/Cu(100) film have been directly investigated with the depth-resolved x-ray magnetic circular dichroism technique. An oscillatory behavior in the Fe surface magnetization as a function of Fe thickness is found. The spectra were analyzed with a simple magnetic model, in which only surface two layers and interface (bottom) single layer are magnetically active. The analysis clearly shows existence of an oscillatory or rotational interlayer magnetic coupling between the surface and interface of the Fe film via the inner layers with the interface magnetization essentially unchanged. Temperature dependent experiments showed that the surface magnetization vanishes with increasing temperature, while the interface one stays unchanged., AMERICAN PHYSICAL SOC
PHYSICAL REVIEW B, Nov. 2004

Direct observation of oscillatory behavior in the surface magnetization of Fe thin films grown on a Ni/Cu(100) film
Kenta Amemiya; Daiju Matsumura; Hitoshi Abe; Soichiro Kitagawa; Toshiaki Ohta; Toshihiko Yokoyama, The surface and interface magnetic structures of Fe thin films (4-11 ML) grown on a 6 ML Ni/Cu(100) film have been directly investigated with the depth-resolved x-ray magnetic circular dichroism technique. An oscillatory behavior in the Fe surface magnetization as a function of Fe thickness is found. The spectra were analyzed with a simple magnetic model, in which only surface two layers and interface (bottom) single layer are magnetically active. The analysis clearly shows existence of an oscillatory or rotational interlayer magnetic coupling between the surface and interface of the Fe film via the inner layers with the interface magnetization essentially unchanged. Temperature dependent experiments showed that the surface magnetization vanishes with increasing temperature, while the interface one stays unchanged.
Physical Review B - Condensed Matter and Materials Physics, Nov. 2004, [Reviewed]

Direct observation of magnetic depth profiles of thin Fe films on Cu(100) and Ni/Cu(100) with the depth-resolved x-ray magnetic circular dichroism
K Amemiya; S Kitagawa; D Matsumura; H Abe; T Ohta; T Yokoyama, A depth-resolved technique in the x-ray magnetic circular dichroism (XMCD) has been developed and applied to Fe/Cu(100) and Fe/Ni/Cu(100) in order to observe the magnetic depth profile directly. It was confirmed that the surface two layers of the 7 ML Fe/Cu(100) are ferromagnetically coupled, while the inner layers are in the spin density wave (SDW) state at 130 K. The technique enables one to extract the XMCD spectra from the surface ferromagnetic (FM) and inner SDW regions separately, indicating that the FM/SDW interface has an antiparallel magnetic coupling, and that the SDW region has the bulk-like feature. For Fe/Ni/Cu(100), we have observed magnetically live surface layers and some thickness dependent magnetic coupling between the Fe surface and Ni film. (C) 2004 American Institute of Physics., AMER INST PHYSICS
APPLIED PHYSICS LETTERS, Feb. 2004

NaAlH₄-TiCl₃の水素放出再吸蔵過程における中性子・X線散乱による構造解析と触媒効果の発現
池田一貴; 池田一貴; 池田一貴; 藤崎布美佳; 藤崎布美佳; 大友季哉; 大友季哉; 大友季哉; 大友季哉; 大下英敏; 本田孝志; 本田孝志; 本田孝志; 川又透; 有馬寛; 有馬寛; 杉山和正; 阿部仁; 阿部仁; 阿部仁; KIM Yunjeong; 榊浩司; 中村優美子; 町田晃彦; 佐藤豊人; 佐藤豊人; 高木成幸; 折茂慎一
日本金属学会講演大会(Web), 2022

Atom and ion transport mechanism in NaAlH₄-Ti compounds
大友季哉; 大友季哉; 大友季哉; 藤崎布美佳; 本田孝志; 本田孝志; 大下英敏; 池田一貴; 中尾裕則; 中尾裕則; 阿部仁; 阿部仁; 有馬寛; 杉山和正; 佐藤豊人; 折茂慎一; 榊浩司; KIM Hyunjeong; 中村優美子
量子ビームサイエンスフェスタ(Web), 2018

Back cover: Slow magnetic relaxation and luminescence of Tb-based coordination polymer
Takefumi Yoshida; Yemineni S. L. V. Narayana; Hitoshi Abe; Masayoshi Higuchi
Dalton Trans., 2018, [Invited]

High-pressure in-situ XAFS-XRD measurements of liquid iodine with MAX80　　　　　　　　　　　　　　　
D. Wakabayashi; N. Funamori; T. Kikegawa; K. Watanabe; S. Kohara; H. Nitani; Y. Niwa; Y. Takeichi; H. Abe; M. Kimura
Photon Factory Highlights 2017, 2018, [Invited]

カルシウムアミド上にフラットな形状で自己組織化したRuナノ粒子によるアンモニア合成
井上泰徳; 北野政明; 岸田和久; 阿部仁; 阿部仁; 阿部仁; 丹羽尉博; 笹瀬雅人; 横山壽治; 原亨和; 原亨和; 細野秀雄; 細野秀雄; 細野秀雄
Photon Factory News, May 2017

Atom and ion transport mechanism in NaAlH₄-Ti compounds
大友季哉; 大友季哉; 大友季哉; 藤崎布美佳; 本田孝志; 本田孝志; 大下英敏; 池田一貴; 中尾裕則; 中尾裕則; 阿部仁; 阿部仁; 有馬寛; 杉山和正; 佐藤豊人; 折茂慎一; 榊浩司; KIM Hyunjeong; 中村優美子
量子ビームサイエンスフェスタ(Web), 2017

In‐situ電気化学XAFS法を用いた半導体光電極から酸素生成助触媒への励起ホール移動の観測
蓬田匠; 吉田真明; 峯尾岳大; 新田清文; 加藤和男; 増田卓也; 仁谷浩明; 阿部仁; 高草木達; 宇留賀朋哉; 朝倉清高; 魚崎浩平; 近藤寛
日本放射光学会年会・放射光科学合同シンポジウム予稿集, 11 Jan. 2014

In‐situ X線吸収分光法による水分解光電極上の酸化マンガン助触媒への電荷移動の観測
吉田真明; 蓬田匠; 峯尾岳大; 新田清文; 加藤和男; 増田卓也; 仁谷浩明; 阿部仁; 高草木達; 宇留賀朋哉; 朝倉清高; 魚崎浩平; 近藤寛
電気化学会大会講演要旨集, 29 Mar. 2013

半導体光電極から酸化マンガン助触媒への励起ホールの移動と光電極活性との相関
蓬田匠; 吉田真明; 峯尾岳大; 新田清文; 加藤和男; 増田卓也; 仁谷浩明; 阿部仁; 高草木達; 宇留賀朋哉; 朝倉清高; 魚崎浩平; 近藤寛
電気化学会大会講演要旨集, 29 Mar. 2013

In‐situ X線吸収分光法による水分解用光電極上の酸素生成助触媒への励起キャリア移動の観測
吉田真明; 蓬田匠; 峯尾岳大; 前田彩綾; 新田清文; 加藤和男; 増田卓也; 仁谷浩明; 阿部仁; 高草木達; 宇留賀朋哉; 朝倉清高; 魚崎浩平; 近藤寛
触媒討論会講演予稿集, 11 Mar. 2013

Study on cobalt phosphate cocatalyst (Co-Pi) on photoelectrode for overall water splitting by XAFS
Mineo Takehiro; Uruga Tomoya; Asakura Kiyotaka; Uosaki Kohei; Kondoh Hiroshi; Yoshida Masaaki; Yomogida Takumi; Nitta Kiyofumi; Kato Kazuo; Masuda Takuya; Nitani Hiroaki; Abe Hitoshi; Takakusagi Satoru
Abstract of annual meeting of the Surface Science of Japan, 2013

Observation of photoexcited carrier transfer to MnOx/SrTiO3 photocatalyst by In-Situ XAFS
Yoshida Masaaki; Takakusagi Satoru; Uruga Tomoya; Asakura Kiyotaka; Uosaki Kohei; Kondoh Hiroshi; Gon Narihiro; Yomogida Takumi; Mineo Takehiro; Nitta Kiyohumi; Kato Kazuo; Masuda Takuya; Nitani Hiroaki; Abe Hitoshi
Abstract of annual meeting of the Surface Science of Japan, 2013

In‐situ X線吸収分光法を利用した水分解用光電極上の酸化マンガン助触媒への励起キャリア移動の観測
吉田真明; 蓬田匠; 峯尾岳大; 前田彩綾; 新田清文; 加藤和男; 増田卓也; 仁谷浩明; 阿部仁; 高草木達; 宇留賀朋哉; 朝倉清高; 魚崎浩平; 近藤寛
表面科学学術講演会講演要旨集, 20 Nov. 2012

In‐Situ電気化学蛍光XAFSによる光電極表面上の助触媒への電荷移動の測定
蓬田匠; 吉田真明; 畑廷尚; 豊島遼; 新田清文; 加藤和男; 増田卓也; 仁谷浩明; 阿部仁; 高草木達; 宇留賀朋哉; 朝倉清高; 魚崎浩平; 近藤寛
Photon Fact News, Aug. 2012

In‐situ電気化学XAFS法による水分解用光電極上の酸素生成助触媒への電荷移動の観察
吉田真明; 蓬田匠; 畑廷尚; 豊島遼; 新田清文; 加藤和男; 増田卓也; 仁谷浩明; 阿部仁; 高草木達; 宇留賀朋哉; 朝倉清高; 魚崎浩平; 近藤寛
日本化学会講演予稿集, 09 Mar. 2012

In‐Situ電気化学蛍光XAFSによる光電極表面上の助触媒への電荷移動の測定
蓮田匠; 吉田真明; 畑廷尚; 豊島遼; 新田清文; 加藤和男; 増田卓也; 仁谷浩明; 阿部仁; 高草木達; 宇留賀朋哉; 朝倉清高; 魚崎浩平; 近藤寛
PFシンポジウム要旨集, 2012

Photo-excited carrier transfer to Mn-oxide cocatalysts on the photoelectrode for water splitting studied by In-situ XAFS
Yoshida Masaaki; Takakusagi Satoru; Uruga Tomoya; Asakura Kiyotaka; Uosaki Kohei; Kondoh Hiroshi; Yomogida Takumi; Mineo Takehiro; Maeda Saya; Nitta Kiyofumi; Kato Kazuo; Masuda Takuya; Nitani Hiroaki; Abe Hitoshi
Abstract of annual meeting of the Surface Science of Japan, 2012

28aHE-5 Magnetic and film structure changes of CO adsorbed Fe/(Cu(001) films studied by XMCD, EXAFS
Abe H.; Amemiya K.; Sakamaki M.; Kouzai S.; Kondoh H.
Meeting abstracts of the Physical Society of Japan, 03 Mar. 2011

25pRA-3 Surface magnetic state change and structure of Fe/Cu(001) upon NO, CO adsorption
Abe H.; Sakamaki M.; Amemiya K.; Kondoh H.
Meeting abstracts of the Physical Society of Japan, 18 Aug. 2009

25pRA-7 Relation between atomic and magnetic structures in magnetic thin films (1) : Co/Ru (0001)
Amemiya K.; Miyawaki J.; Sakamaki M.; Abe H.; Sako E. O.
Meeting abstracts of the Physical Society of Japan, 18 Aug. 2009

30aTF-2 Depth-resolved XMCD observation of surface antiferromagnetic coupling of Fe/Cu(001) induced by NO adsorption
Abe H.; Amemiya K.; Sakamaki M.
Meeting abstracts of the Physical Society of Japan, 03 Mar. 2009

30aTF-1 Temperature dependence of magnetization in the interface and inner layers of Cu/Ni/Cu(100) thin films
Amemiya Kenta; Sakamaki Masako; Abe Hitoshi
Meeting abstracts of the Physical Society of Japan, 03 Mar. 2009

20aXA-4 Observation of the magnetism of NO/Fe/Cu (001) films by using depth-resolved XMCD technique
Abe H.; Sakamaki M.; Amemiya K.
Meeting abstracts of the Physical Society of Japan, 25 Aug. 2008

21aWD-2 Magnetic structure of Fe/Ni/Cu(100) thin films studied by a three-dimensional micro XMCD technique
Amemiya K.; Abe H.; Sako E.; Miyawaki J.; Sakamaki M.
Meeting abstracts of the Physical Society of Japan, 21 Aug. 2007

21aWD-3 Spin reorientation transitions of Fe/Co/Pd(111) magnetic thin films and large perpendicular magnetic anisotropy of 1 ML Fe
Abe H.; Miyawaki J.; Sako E. O.; Amemiya K.
Meeting abstracts of the Physical Society of Japan, 21 Aug. 2007

Geometric, Electronic and Magnetic structures of magnetic thin films studied by inner-shell spectropscopies
T. Olita; K. Amemiya; D. Matsumura; H. Abe
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, May 2007

18aTB-4 Magnetic and atomic structures of Ru/Co/Ru(0001) thin films studied by the depth-resolved XMCD and EXAFS
Amemiya Kenta; Miyawaki Jun; Abe Hitoshi; Sako Erika
Meeting abstracts of the Physical Society of Japan, 28 Feb. 2007

18aTB-3 The magnetic state variations of Fe/Cu(001) thin films induced by CO adsorption
Abe H.; Amemiya K.; Matsumura D.; Miyawaki J.; Ohtsuki T.; Sakai E.; Ohta T.
Meeting abstracts of the Physical Society of Japan, 28 Feb. 2007

26aYH-2 The origin of perpendicular magnetic anisotropy in Ru/Co/Ru(0001)
Miyawaki J.; Matsumura D.; Abe H.; Otsuki T.; Sakai E.; Amemiya K.; Ohta T.
Meeting abstracts of the Physical Society of Japan, 18 Aug. 2006

21aXB-4 Surface and interface XMCD spectra for Ni/Cu(100) thin films
Amemiya Kenta; Sakai Enju; Matsumura Daiju; Abe Hitoshi; Ohta Toshiaki
Meeting abstracts of the Physical Society of Japan, 19 Aug. 2005

14aXD-5 Spin reorientation transition induced by CO adsorption studied by the depth-resolved XMCD : Separation of the surface and bulk XMCD spectra
Amemiya Kenta; Matsumura Daiju; Sakai Enju; Abe Hitoshi; Yokoyama Toshihiko; Ohta Toshiaki
Meeting abstracts of the Physical Society of Japan, 25 Aug. 2004

14aXD-4 Spin reorientation transition of Co/Pd(111) induced by surface gaseous adsorption
Matsumura D.; Yokoyama T; Nakagawa T; Watanabe H.; Amemiya K.; Abe H.; Ohta T.
Meeting abstracts of the Physical Society of Japan, 25 Aug. 2004

14aXD-4 Spin reorientation transition of Co/Pd(111) induced by surface gaseous adsorption
Matsumura D.; Yokoyama T.; Nakagawa T.; Watanabe H.; Amemiya K.; Abe H.; Ohta T.
Meeting abstracts of the Physical Society of Japan, 25 Aug. 2004

14aXD-5 Spin reorientation transition induced by CO adsorption studied by the depth-resolved XMCD : Separation of the surface and bulk XMCD spectra
Amemiya Kenta; Matsumura Daiju; Sakai Enju; Abe Hitoshi; Yokoyama Toshihiko; Ohta Toshiaki
Meeting abstracts of the Physical Society of Japan, 25 Aug. 2004

30aWR-4 X-ray magnetic circular dichroism study on spin reorientation transitions of Fe/Ni/Cu(001)
阿部 仁; 雨宮 健太; 松村 大樹; 北川 聡一郎; 渡邊 廣憲; 横山 利彦; 太田 俊明
Meeting abstracts of the Physical Society of Japan, 03 Mar. 2004

30aWR-7 XMCD study on an anomalous magnetic state during the adsorption-induced spin reorientation transition of magnetic thin films
Amemiya Kenta; Matsumra Daiju; Abe Hitoshi; Kitagawa Soichiro; Miyawaki Jun; Yokoyama Toshihiko; Ohta Toshiaki
Meeting abstracts of the Physical Society of Japan, 03 Mar. 2004

30aWR-4 X-ray magnetic circular dichroism study on spin reorientation transitions of Fe/Ni/Cu(001)
Abe Hitoshi; Amemiya Kenta; Matsumura Daiju; Kitagawa Soichiro; Watanabe Hirokazu; Yokoyama Toshihiko; Ohta Toshiaki
Meeting abstracts of the Physical Society of Japan, 03 Mar. 2004

30aWR-7 XMCD study on an anomalous magnetic state during the adsorption-induced spin reorientation transition of magnetic thin films
Amemiya Kenta; Matsumra Daiju; Abe Hitoshi; Kitagawa Soichiro; Miyawaki Jun; Yokoyama Toshihiko; Ohta Toshiaki
Meeting abstracts of the Physical Society of Japan, 03 Mar. 2004

XAFS studies at Photon Factory, KEK, and a faculty and student team visit　　　　　　　　　　　　　　　
H. Abe
The 2022 joint virtual meeting of the African Light Source (AfLS), the African Physical Society (AfPS), AfLS-AfPS 2022, 14 Nov. 2022
20221114, 20221118

Surface sensitive hard x-ray spectroscopy, Total REflection X-ray Spectroscopy (TREXS), to study surface chemical reactions　　　　　　　　　　　　　　　
H. Abe; Y. Niwa; M. Kimura
The 22nd International Vacuum Congress (IVC-22), 13 Sep. 2022
20220911, 20220916

Examples of XAFS studies at Photon Factory　　　　　　　　　　　　　　　
H. Abe
LAAAMP Africa Workshop, 08 Sep. 2022, [Invited]
20220908, 20220908

HIP接合Fe-Cu中のCuの特異な局所構造　　　　　　　　　　　　　　　
阿部 仁; 尾ノ井正裕; 木村惇郎
第25回XAFS討論会, 04 Aug. 2022
20220802, 20220804

XAFS application to low dimensional science and low dimensionally modified material　　　　　　　　　　　　　　　
H. Abe
The 18th International Conference on X-Ray Absorption Fine Structure 2022 (XAFS2022), 14 Jul. 2022
20220710, 20220715

Anomalous Cu phase at HIP bonded Fe-Cu interface　　　　　　　　　　　　　　　
H. Abe; M. Seo; M. Onoi; A. Kimura
The 18th International Conference on X-Ray Absorption Fine Structure 2022 (XAFS2022), 11 Jul. 2022, [Invited]
20220710, 20220715

XAFS applications to characterise metal species in foods　　　　　　　　　　　　　　　
H. Abe
Neutrons and Food6, 17 May 2022, [Invited]
20220516, 20220518

X-ray absorption spectroscopy applications to materials science　　　　　　　　　　　　　　　
Hitoshi Abe
Asian Collaboration Research Science Lecture Series, 12 Mar. 2022, [Invited]
20220312, 20220312

CaCl2水溶液投与によるブロッコリースプラウトへのCa蓄積　　　　　　　　　　　　　　　
阿部 仁; 大下宏美
第35回日本放射光学会年会・放射光科学合同シンポジウム(JSR2022), 09 Jan. 2022
20220107, 20220109

Development of surface sensitive hard x-ray spectroscopy, Total REflection X-ray Spectroscopy (TREXS), for studies on energy-related materials　　　　　　　　　　　　　　　
H. Abe; Y. Niwa; M. Kimura
The International Chemical Congress of Pacific Basin Societies 2021 (Pacifichem2021), 21 Dec. 2021
20211216, 20211221

ブロッコリースプラウトへのCaCl2水溶液投与による子葉へのCa蓄積　　　　　　　　　　　　　　　
阿部仁; 大下宏美
第24回XAFS討論会, 02 Sep. 2021
20210901, 20210903

Surface sensitive x-ray spectroscopy (TREXS) for nanoscale surface study and multi-modal development
Hitoshi Abe; Yasuhiro Niwa; Masao Kimura
The 25th Congress of the International Union of Crystallography (IUCr2021), Prague, Czech Republic, 19 Aug. 2021
20210814, 20210820

XAFS as a tool to study chemical states and local structures　　　　　　　　　　　　　　　
Hitoshi Abe
The 1st National Congress of the Mexican Society of Synchrotron Light / The 1st International Congress of Synchrotron Light Techniques, 22 Jun. 2021, [Invited]
20210621, 20210626

XAFS BLs and studies at Photon Factory, KEK　　　　　　　　　　　　　　　
Hitoshi Abe
Joint Users' Meeting of Synchrotron and Neutron Projects (PETRA, KEK and ISIS-RAL), JNCASR (India), 05 Mar. 2021, [Invited]
20210304, 20210305

ホウレン草中のCaのXAFSを用いた非破壊化学状態分析
阿部仁
第34回日本放射光学会年会・放射光科学合同シンポジウム (JSR2021), 08 Jan. 2021, [Invited]
20210110, 20210110

Multi-Modal Surface Research Equipment by Combining TREXS and IRRAS
阿部仁; 丹羽尉博; 木村正雄
Quantum Beam Science Festa, 13 Mar. 2020

二刀流ビームラインのための薄膜ビームスプリッターの検討　　　　　　　　　　　　　　　
阿部仁
第33回日本放射光学会年会・放射光科学合同シンポジウム (JSR2020), 12 Jan. 2020
20200110, 20200112

TREXSとIRRASによる表面の複合実験環境の開発と現状
阿部仁; 丹羽尉博; 木村正雄
第33回日本放射光学会年会・放射光科学合同シンポジウム (JSR2020), 12 Jan. 2020
20200110, 20200112

Fundamental of XAFS and surface observation　　　　　　　　　　　　　　　
Hitoshi Abe
日本表面真空学会 東日本合同セミナー「放射光を利用した次世代の表面研究」, 16 Nov. 2019, [Invited]
20191116, 20191116

Development of multi-modal experimental environment of surfaces by combining TREXS and IRRAS　　　　　　　　　　　　　　　
Hitoshi Abe; Yasuhiro Niwa; Masao Kimura
第22回XAFS討論会, 03 Sep. 2019
20190902, 20190904

XAFS as a tool to obtain chemical states and local structures　　　　　　　　　　　　　　　
Hitoshi Abe
The second African Light Source Conference (AfLS2), 31 Jan. 2019, [Invited]
20190128, 20190202

Multi-modal surface research equipment by combining TREXS and IRRAS　　　　　　　　　　　　　　　
Hitoshi Abe; Yasuhiro Niwa; Masao Kimura
JSR2019, 11 Jan. 2019

A two-color BL brings new colors of a SR facility　　　　　　　　　　　　　　　
H. Abe
U Tokyo ISSP Regular Workshop "Upshift in the Soft X-ray Science of Synchrotron Radiation", 01 Dec. 2018, [Invited]

Recent XAFS topics　　　　　　　　　　　　　　　
Hitoshi Abe
Steering Committee and Users' Meeting of Indian Beamline, 25 Sep. 2018, [Invited]

Ru-N bond observed in ammonia synthesis catalysts Ru/Ca2NH, Ru/Ca(NH2)2 and its anchoring effect　　　　　　　　　　　　　　　
H. Abe; Y. Niwa; M. Kitano; Y. Inoue; M. Sasaue; T. Nakao; T. Tada; T. Yokoyama; M. Hara; H. Hosono
The 21st Japanese XAFS conference, 04 Sep. 2018

Anchoring bond in Ru/Ca2NH catalyst keeping high NH3 synthesis activity　　　　　　　　　　　　　　　
H. Abe; Y. Niwa; M. Kitano; Y. Inoue; M. Sasaue; T. Nakao; T. Tada; T. Yokoyama; M. Hara; H. Hosono
17th International Conference on X-ray Absorption Fine Structure (XAFS2018), 26 Jul. 2018

Development of multi-modal surface research equipment by combining TREXS with IRRAS　　　　　　　　　　　　　　　
H. Abe; Y. Niwa; M. Kimura
Synchrotron Radiation Instrumentation 2018 (SRI2018), 10 Jun. 2018

Ru-N bond and its anchoring effect of NH3 synthesis catalysts, Ru/Ca(NH2)2 and Ru/Ca2NH, observed by XAFS　　　　　　　　　　　　　　　
H. Abe; Y. Niwa; M. Kitano; Y. Inoue; M. Sasase; T. Nakao; T. Tada; T. Yokoyama; M. Hara; H. Hosono
Quantum Beam Science Festa, 03 Mar. 2018, [Invited]

Anchoring bond of catalysis particles found in highly active NH3 synthesis catalysts　　　　　　　　　　　　　　　
H. Abe; Y. Niwa; M. Kitano; Y. Inoue; M. Sasase; T. Nakao; T. Tada; T. Yokoyama; M. Hara; H. Hosono
the 3rd Element Strategy Initiative: To Form Core Research Centers Symposium on the Elements Strategy Large-scale Research Facilities, 05 Feb. 2018

アンモニア合成触媒Ru/Ca(NH2)2, Ru/Ca2NHで見出したRu-N結合とアンカー効果　　　　　　　　　　　　　　　
阿部 仁
エレクトライドに関するJST-ACCELシンポジウム -触媒とOLED-, 20 Jan. 2018

アンモニア合成触媒Ru/Ca2NHでRu粒子のアンカーとして働くRu-N結合　　　　　　　　　　　　　　　
阿部 仁; 丹羽尉博; 北野政明; 井上泰徳; 笹瀬雅人; 中尾琢哉; 多田朋史; 横山壽治; 原 亨和; 細野秀雄
第31回日本放射光学会年会・放射光科学合同シンポジウム, 09 Jan. 2018

硬X線から見る物質構造科学研究(所)の姿　　　　　　　　　　　　　　　
阿部 仁
物質構造科学研究所 設立20周年記念シンポジウム「物質構造科学の過去・現在・未来」, 27 Dec. 2017

In situ TREXS Observation of Surface Reduction Reaction of NiO Flim with ~2 nm surface sensitivity　　　　　　　　　　　　　　　
H. Abe; Y. Niwa; Y. Takeichi; M. Kimura
International Symposium on Novel Energy Nanomaterials, Catalysts and Surfaces for Future Earth, 30 Oct. 2017

原子と原子が手をつなぐ！！ 〜放射光XAFSで覗くミクロの世界〜　　　　　　　　　　　　　　　
阿部 仁
大学共同利用機関シンポジウム, 08 Oct. 2017

Harmonics issues on XAFS measurements and discussion of quality　　　　　　　　　　　　　　　
Hitoshi Abe
Q2XAFS2017, 14 Aug. 2017, [Invited]

Ca K-edge XANES and Ca oxidation number estimation of Ca-N compounds by defining electron biasing parameter　　　　　　　　　　　　　　　
H. Abe; Y. Niwa; M. Kitano; Y. Inoue; T. Yokoyama; M. Hara; H. Hosono
JXAFS20, 06 Aug. 2017

Observation of surface reduction of NiO by total reflection X-ray spectroscopy (TREXS) and outlook for its development　　　　　　　　　　　　　　　
H. Abe; Y. Niwa; Y. Takeichi; M. Kimura
JXAFS20, 05 Aug. 2017

XAFS can be a powerful method to characterise chromogenic materials　　　　　　　　　　　　　　　
Hitoshi Abe
The 2nd International Workshop on Chromogenic Materials and Devices, 07 Jul. 2017, [Invited]

硬X線領域での表面敏感な化学状態および局所構造解析のための全反射X線分光法(TREXS)の開発　　　　　　　　　　　　　　　
Hitoshi Abe
第1回 表界面計測技術研究会, 25 Feb. 2017, [Invited]

12CaO・7A2O3エレクトライドに担持されたRuナノ粒子が発現する高い酸化耐性　　　　　　　　　　　　　　　
阿部 仁; 丹羽尉博; 北野政明; 井上泰徳; 村上洋一; 横山壽治; 原 亨和; 細野秀雄
JSR2017, 08 Jan. 2017

Our recent XAFS studies: (1) a new surface sensitive XAFS method, (2) properties of nanoparticles on electrodes　　　　　　　　　　　　　　　
Hitoshi Abe
The International Symposium of Quantum Beam Science at Ibaraki University, 19 Nov. 2016, [Invited]

高濃度試料でも正しい蛍光法スペクトルが得られる 砂目サンプルホルダーの開発　　　　　　　　　　　　　　　
阿部 仁; 丹羽尉博; 木村正雄; 村上洋一; 横山壽治; 細野秀雄
JXAFS19, 04 Sep. 2016

表面敏感なXAFS測定法の開発とNi薄膜の表面酸化層の還元過程のリアルタイム観察　　　　　　　　　　　　　　　
阿部 仁; 丹羽尉博; 仁谷浩明; 野村昌治
日本放射光学会年会・放射光科学合同シンポジウム, 11 Jan. 2016

Development of surface sensitive XAFS method based on Kramers-Kronig relations for surface chemistry　　　　　　　　　　　　　　　
Hitoshi Abe; Yasuhiro Niwa; Hiroaki Nitani; Masaharu Nomura
2015 International Chemical Congress of Pacific Basin Societies (Pacifichem2015), 16 Dec. 2015

Our plan of schools and practical trainings to contribute to the African Light Source project　　　　　　　　　　　　　　　
Hitoshi Abe
First AfLS Conference & Workshop 2015, 16 Nov. 2015

Observations of Ni(30 nm)/Si surface redox processes by Kramers-Kronig reflection XAFS method　　　　　　　　　　　　　　　
Hitoshi Abe; Yasuhiro Niwa; Hiroaki Nitani; Masaharu Nomura
16th International Conference on X-ray Absorption Fine Structure (XAFS16), 24 Aug. 2015

ホウレン草に含有されるCaのXANESによる分析　　　　　　　　　　　　　　　
Hitoshi Abe
第18回XAFS討論会 (JXAFS18), 30 Jul. 2015

Kramers-Kronigの関係式を用いた表面敏感なXAFS測定法の開発と表面酸化Ni薄膜の還元過程の観察　　　　　　　　　　　　　　　
阿部 仁; 丹羽尉博; 仁谷浩明; 野村昌治
第18回XAFS討論会 (JXAFS18), 30 Jul. 2015

Development of surface sensitive Kramers-Kronig reflection XAFS method and its application to in situ observation of reduction of NiO to Ni metal　　　　　　　　　　　　　　　
Hitoshi Abe; Yasuhiro Niwa; Hiroaki Nitani; Masaharu Nomura
12th International Conference on Synchrotron Radiation Instrumentation (SRI2015), 07 Jul. 2015

XAFS microscopy and dynamics for materials science　　　　　　　　　　　　　　　
Hitoshi Abe; Yasuo Takeichi; Hiroaki Nitani; Yasuhiro Niwa; Masao Kimura
Okazaki Conference, 04 Feb. 2015, [Invited]

Kramers-Kronig変換を用いた表面敏感なXAFS測定法の開発とNi薄膜の酸化還元過程観測への適用　　　　　　　　　　　　　　　
阿部 仁; 丹羽尉博; 仁谷浩明; 野村昌治
第17回XAFS討論会 (JXAFS17), 02 Sep. 2014

Kramers-Kronigの関係式を用いた表面敏感な反射型 DXAFS測定法の開発状況　　　　　　　　　　　　　　　
阿部 仁; 丹羽尉博; 仁谷浩明; 野村昌治
日本放射光学会年会・放射光科学合同シンポジウム, 11 Jan. 2014

Kramers-Kronig の関係式による表面敏感なDXAFS 測定法の開発　　　　　　　　　　　　　　　
阿部 仁; 丹羽尉博; 仁谷浩明; 野村昌治
第16回XAFS討論会 (JXAFS16), 06 Sep. 2013

XMCD and EXAFS studies on Fe/Cu(001) and other magnetic thin films　　　　　　　　　　　　　　　
H. Abe
37th Annual Conference on Magnetics in Japan, 04 Sep. 2013, [Invited]

Development of surface sensitive DXAFS measurement method by applying Kramers-Kronig relationship to total reflection spectra　　　　　　　　　　　　　　　
Hitoshi Abe; Yasuhiro Niwa; Hiroaki Nitani; Masaharu Nomura
Light and Particle Beams in Materials Science 2013 (LPBMS2013), 29 Aug. 2013

Development status of surface sensitive DXAFS method by Kramers-Kronig relation　　　　　　　　　　　　　　　
Hitoshi Abe; Yasuhiro Niwa; Hiroaki Nitani; Masaharu Nomura
PF Symposium, 14 Mar. 2013

Attempt to obtain XAFS spectra from reflection spectra by Kramers-Kronig transformation　　　　　　　　　　　　　　　
H. Abe; T. Nakayama; Y. Niwa; H. Nitani; H. Kondoh; M. Nomura
JXAFS15, 11 Sep. 2012

Attempt to obtain surface sensitive XAFS spectra by applying Kramers-Kronig relation to total reflection spectra　　　　　　　　　　　　　　　
H. Abe; T. Nakayama; Y. Niwa; H. Nitani; H. Kondoh; M. Nomura
The 15th International Conference on X-ray Absorption Fine Structure (XAFS15), 22 Jul. 2012

Enjoy yourself in the world -to make your dream come true-　　　　　　　　　　　　　　　
H. Abe
UT GCOE carrier symposium "Take off for your dream!", 16 Jan. 2012, [Invited]

Magnetic and Film Structures of NO, CO Adsorbed Fe/Cu (001)　　　　　　　　　　　　　　　
H. Abe; K. Amemiya; M. Sakamaki; Y. Kousa; S. Kozai; H. Kondoh
SSSJ Annual meeting, 16 Dec. 2011

CO, NO adsorbed Fe/Cu(001) magnetic thin films studies by means of depth-resolved XMCD and EXAFS　　　　　　　　　　　　　　　
H. Abe; K. Amemiya; M. Sakamaki; S. Kozai; Y. Kousa; T. Nakayama; H. Kondoh
JXAFS14, 11 Sep. 2011

Experimental methods with synchrotron radiation x-rays -XPS, XAFS-　　　　　　　　　　　　　　　
H. Abe
Lecture at Dept. of Applied Chemistry, Ritsumeikan Univ., 09 Jun. 2011, [Invited]

Magnetic and film structure changes of CO adsorbed Fe/Cu(001) films studied by XMCD, EXAFS　　　　　　　　　　　　　　　
H. Abe; K. Amemiya; M. Sakamaki; S. Kozai; H. Kondoh
Annual meeting, The Physical Society of Japan, Mar. 2011

CO吸着前後のFe/Cu(001)薄膜の磁性と構造　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 酒巻真粧子; 香西将吾; 小宇佐友香; 中山丈嗣; 近藤寛
第24回放射光学会年会・合同シンポジウム（つくば）, 08 Jan. 2011

XMCD, EXAFSで見るCO, NO吸着Fe/Cu(001)の磁性と構造　　　　　　　　　　　　　　　
第28回PFシンポジウム, 2011

Magnetism and structures of CO, NO adsorbed Fe/Cu(001) observed by XMCD, EXAFS　　　　　　　　　　　　　　　
The 28th PF Symposium, 2011

Magnetism and structure of Fe/Cu(001) films before and after CO adsorption　　　　　　　　　　　　　　　
Japanese Society for Synchrotron Radiation Research, 2011

Anomalous magnetic properties of CO-adsorbed Fe/Cu(001) films and their film structures　　　　　　　　　　　　　　　
Hitoshi Abe; Masako Sakamaki; Kenta Amemiya; Hiroshi Kondoh
The 2010 International Chemical Congress of Pacific Basin Societies (Pacifichem2010), 15 Dec. 2010

Anomalous surface magnetism and structure of CO/Fe/Cu(001), NO/Fe/Cu(001) observed by depth-resolved XMCD and EXAFS　　　　　　　　　　　　　　　
物構研シンポジウム, 2010

CO/Fe/Cu(001), NO/Fe/Cu(001)の磁性と構造のXMCDとEXAFSによる研究　　　　　　　　　　　　　　　
XAFS討論会（第13回）, 2010

CO/Fe/Cu(001), NO/Fe/Cu(001)の表面磁性の深さ分解XMCD法による観察　　　　　　　　　　　　　　　
第27回PFシンポジウム, 2010

XAFS of soft x-ray region　　　　　　　　　　　　　　　
SESAME-JSPS-KEK-Sabanci School, 2010

Anomalous surface magnetism and structure of CO/Fe/Cu(001), NO/Fe/Cu(001) observed by depth-resolved XMCD and EXAFS　　　　　　　　　　　　　　　
IMSS Symposium, 2010

XMCD and EXAFS studies of the magnetism and structures of CO/Fe/Cu(001), NO/Fe/Cu(001)　　　　　　　　　　　　　　　
XAFS conference, Japan (13th), 2010

Observation of surface magnetism of CO/Fe/Cu(001), NO/Fe/Cu(001) by means of depth-resolved XMCD method　　　　　　　　　　　　　　　
The 27th PF Symposium, 2010

XAFS of soft x-ray region　　　　　　　　　　　　　　　
SESAME-JSPS-KEK-Sabanci School, 2010

NOまたはCO吸着Fe/Cu(001)の磁性と構造　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 酒巻真粧子; 小宇佐友香; 香西将吾; 近藤 寛
第29回表面科学学術講演会, 28 Oct. 2009
20091027, 20091029

NO等の吸着によるFe/Cu(001)の表面磁性変化とその構造　　　　　　　　　　　　　　　
阿部 仁; 酒巻真粧子; 雨宮健太; 近藤 寛
日本物理学会（2009年秋季大会）, 25 Sep. 2009
20090925, 20090928

CO,NO吸着Fe/Cu(001)薄膜の磁気構造と薄膜構造　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 酒巻真粧子; 香西将吾; 小宇佐友香; 中山丈嗣; 近藤 寛
XAFS討論会（第12回）, 15 Sep. 2009
20090914, 20090916

Surface antiferromagnetic coupling of Fe/Cu(001) induced by NO adsorption studied by means of depth-resolved XMCD method　　　　　　　　　　　　　　　
H. Abe; M. Sakamaki; K. Amemiya
14th International Conference on X-ray Absorption Fine Structure (XAFS14), 28 Jul. 2009
20090726, 20090731

NO Adsorption Induced Antiferromagnetic Coupling at The Surface of Fe/Cu(001)　　　　　　　　　　　　　　　
H. Abe; M. Sakamaki; K. Amemiya
20th International Colloquium on Magnetic Films and Surfaces (ICMFS2009), 22 Jul. 2009

NO吸着によるFe/Cu(001)の表面反強磁性結合の深さ分解XMCD観測　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 酒巻真粧子
日本物理学会（第64回年次大会）, 30 Mar. 2009
20090327, 20090330

Anomalous magnetic structure and film crystalline structure changes of CO, NO adsorbed Fe/Cu(001) magnetic films　　　　　　　　　　　　　　　
H21year KEK-University cooperation support project, 3rd cooperation mini workshop, 2009

深さ分解XMCD法で見るCO, NO吸着Fe/Cu(001)の表面磁性　　　　　　　　　　　　　　　
物構研シンポジウム, 2009

Dispersive-NEXAFS as a tool to study surface chemical reactions　　　　　　　　　　　　　　　
14th International Conference on X-ray Absorption Fine Structure, 2009

Magnetization Depth Profile in Ultrathin Au/Co/Mo and Au/Co/Au Trilayers　　　　　　　　　　　　　　　
20th International Colloquium on Magnetic Films and Surfaces (ICMFS2009), 2009

Temperature Dependence of Surface and Interface Magnetization of Thin Films Compared with Inner Layers　　　　　　　　　　　　　　　
20th International Colloquium on Magnetic Films and Surfaces (ICMFS2009), 2009

Fe/Cu(001) のNO吸着誘起表面反強磁性の深さ分解XMCD法による観察　　　　　　　　　　　　　　　
第26回PFシンポジウム, 2009

Anomalous magnetic structure and film crystalline structure changes of CO, NO adsorbed Fe/Cu(001) magnetic films　　　　　　　　　　　　　　　
H21year KEK-University cooperation support project, 3rd cooperation mini workshop, 2009

Surface magnetism of CO, NO adsorbed Fe/Cu(001) observed by depth-resolved XMCD technique　　　　　　　　　　　　　　　
IMSS Symposium, 2009

Magnetic and film structures of NO, CO adsorbed Fe/Cu(001)　　　　　　　　　　　　　　　
The 29th Surface Science Symposium, Japan, 2009

Dispersive-NEXAFS as a tool to study surface chemical reactions　　　　　　　　　　　　　　　
14th International Conference on X-ray Absorption Fine Structure, 2009

Surface antiferromagnetic coupling of Fe/Cu(001) induced by NO adsorption studied by means of depth-resolved XMCD method　　　　　　　　　　　　　　　
14th International Conference on X-ray Absorption Fine Structure, 2009

Magnetization Depth Profile in Ultrathin Au/Co/Mo and Au/Co/Au Trilayers　　　　　　　　　　　　　　　
20th International Colloquium on Magnetic Films and Surfaces (ICMFS2009), 2009

Temperature Dependence of Surface and Interface Magnetization of Thin Films Compared with Inner Layers　　　　　　　　　　　　　　　
20th International Colloquium on Magnetic Films and Surfaces (ICMFS2009), 2009

NO Adsorption Induced Antiferromagnetic Coupling at The Surface of Fe/Cu(001)　　　　　　　　　　　　　　　
20th International Colloquium on Magnetic Films and Surfaces (ICMFS2009), 2009

Depth-resolved XMCD observation of surface antiferromagnetic coupling of Fe/Cu(001) induced by NO adsorption　　　　　　　　　　　　　　　
Japan Physical Society (The 64th Annual meeting), 2009

NO adsorption induced surface antiferromagnetism of Fe/Cu(001) observed by depth-resolved XMCD method　　　　　　　　　　　　　　　
The 26th PF Symposium, 2009

深さ分解XMCD法で見るFe/Cu(001) のNO吸着誘起表面反強磁性　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 酒巻真粧子
放射光/表面電子顕微鏡とナノ精密材料科学シンポジウム ―第4回放射光表面科学部会シンポジウム, 24 Dec. 2008

NO吸着によるFe/Cu(001)の表面反強磁性結合及びCO吸着との比較　　　　　　　　　　　　　　　
阿部仁; 雨宮健太; 酒巻真粧子; 宮脇淳; 佐古恵理香; 松村大樹; 大槻匠; 坂井延寿; 太田俊明
第28回表面科学学術講演会, 14 Nov. 2008
20081113, 20081115

CO adsorption effects on the magnetism and surface structure of Fe/Cu(001)　　　　　　　　　　　　　　　
H. Abe; K. Amemiya; J. Miyawaki; E.O. Sako; M. Sakamaki; D. Matsumura; T. Ohtsuki; E. Sakai; T. Ohta
International Symposium on Surface Science and Nanotechnology 5 (ISSS-5), 10 Nov. 2008
20081109, 20081113

深さ分解XMCD法を用いたNO/Fe/Cu(001)薄膜の磁気状態の観測　　　　　　　　　　　　　　　
阿部 仁; 酒巻真粧子; 雨宮健太
日本物理学会（2008年秋季大会）, 20 Sep. 2008

深さ分解XMCD法で見るNO吸着によるFe/Cu(001)薄膜の磁性　　　　　　　　　　　　　　　
阿部 仁; 酒巻真粧子; 雨宮健太
XAFS討論会（第11回）, 07 Aug. 2008

CO/Fe(2, 4 ML)/Cu(001)磁性薄膜の磁気状態の違い　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 松村大樹; 宮脇 淳; 大槻 匠; 坂井延寿; 太田俊明
日本放射光学会, 14 Jan. 2008
20080112, 20080114

CO adsorption effects on the magnetism and surface structure of Fe/Cu(001)　　　　　　　　　　　　　　　
International Symposium on Surface Science and Nanotechnology 5 (ISSS-5), 2008

NO adsorption induced surface anti-ferromagnetism of Fe/Cu(001) observed by the depth-resolved XMCD technique　　　　　　　　　　　　　　　
The 4th Symposium of Synchrotron Radiation Surface Science Division in Surface Science Society of Japan, 2008

NO adsorption induced surface antiferromagnetic coupling of Fe/Cu(001) and the comparison with the CO adsorption　　　　　　　　　　　　　　　
The 28th Surface Science Symposium, Japan, 2008

Observation of the magnetism of NO/Fe/Cu(001) films by using depth-resolved XMCD technique　　　　　　　　　　　　　　　
Japan Physical Society (Autumn meeting), 2008

Magnetism of NO adsorbed Fe/Cu(001) observed by using depth-resolved XMCD technique　　　　　　　　　　　　　　　
XAFS conference, Japan, 2008

Magnetic phase difference of CO/Fe(2, 4 ML)/Cu(001) films　　　　　　　　　　　　　　　
Japanese Society for Synchrotron Radiation Research, 2008

Fe/Co/Pd(111)磁性薄膜のスピン再配列転移と 1 ML Feの大きな面直磁気異方性　　　　　　　　　　　　　　　
阿部 仁; 宮脇 淳; 佐古恵理香; 雨宮健太
日本物理学会, 21 Sep. 2007

Effects of CO adsorption on Fe/Cu(001) magnetic ultrathin films　　　　　　　　　　　　　　　
H. Abe; K. Amemiya; D. Matsumura; J. Miyawaki; E. O. Sako; T. Ohtsuki; E. Sakai; T. Ohta
15th International Conference on Vacuum Ultraviolet Radiation Physics (VUV15), 30 Jul. 2007
20070729, 20070803

CO吸着によるFe/Cu(001)薄膜の磁気状態の変化　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 松村大樹; 宮脇 淳; 大槻 匠; 坂井延寿; 太田俊明
日本物理学会, 18 Mar. 2007
20070318, 20070321

吸着COに起因するFe/Cu(001)薄膜の磁気状態の変化　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 松村大樹; 宮脇 淳; 大槻 匠; 坂井延寿; 太田俊明
日本放射光学会, 14 Jan. 2007
20070112, 20070114

吸着COが引き起こすFe/Cu(001)薄膜の磁気状態の変化　　　　　　　　　　　　　　　
ＰＦシンポジウム, 2007

吸着COによるFe/Cu(001)薄膜の磁気状態の変化　　　　　　　　　　　　　　　
表面科学会「放射光表面科学部会」, 2007

Magnetic phase change of Fe/Cu(001) films by adsorbed CO　　　　　　　　　　　　　　　
SR Surface Science Division in Surface Science Society of Japan, 2007

遷移金属をドープしたTiO2エピタキシャル膜の磁場中XMCD測定　　　　　　　　　　　　　　　
阿部 仁; 島田敏宏; 能川玄之; 雨宮健太; 太田俊明; 稲葉和久; 廣瀬 靖; 古林 寛; 山本幸生; 一杉太郎; 松本祐司; 長谷川哲也
日本物理学会, 26 Sep. 2006

吸着COに起因するFe/Cu(001)磁性薄膜の新たな磁気状態　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 松村大樹; 宮脇 淳; 大槻 匠; 坂井延寿; 太田俊明
XAFS討論会, 08 Sep. 2006
20060907, 20060909

Depth-resolved XMCD study of Spin Reorientation Transitions of Fe/Ni/Cu(001)　　　　　　　　　　　　　　　
H. Abe; K. Amemiya; D. Matsumura; S. Kitagawa; H. Watanabe; T. Yokoyama; T. Ohta
The 19th International Colloquium on Magnetic Films and Surfaces (ICMFS2006), 15 Aug. 2006
20060814, 20060818

XAS and XMCD measurements of transition metal doped TiO2 epitaxial films　　　　　　　　　　　　　　　
阿部 仁; 島田敏宏; 能川玄之; 雨宮健太; 太田俊明; 稲葉和久; 廣瀬 靖; 古林 寛; 山本幸生; 一杉太郎; 松本祐司; 長谷川哲也
Japan Physical Society (61st annual meeting), 28 Mar. 2006
20060327, 20060330

Depth-resolved XMCD application to Fe/Ni/Cu(001) films　　　　　　　　　　　　　　　
The 13th International Conference on X-ray Absorption Fine Structure (XAFS13), 2006

Depth-resolved XMCD application to Fe/Ni/Cu(001) films　　　　　　　　　　　　　　　
The 13th International Conference on X-ray Absorption Fine Structure (XAFS13), 2006

Estimation of magnetic anisotropy energy and SRT of Fe/Ni/Cu(001) studied by using depth-resolved XMCD techinique　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 松村大樹; 北川聡一郎; 渡邊廣憲; 横山利彦; 太田俊明
XAFS討論会, 02 Aug. 2005
20050801, 20050803

深さ分解XMCD法によるFe/Ni/Cu(001)のスピン再配列転移の研究　　　　　　　　　　　　　　　
ＰＦシンポジウム, 2005

Depth-resolved XMCD study on spin reorientation transitions of Fe/Ni/Cu(001)　　　　　　　　　　　　　　　
PF Symposium, 2005

Ni/Cu(001)薄膜のFe蒸着に伴うスピン再配列転移とその機構　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 松村大樹; 北川聡一郎; 渡邊廣憲; 横山利彦; 太田俊明
日本物理学会, 14 Sep. 2004
20040912, 20040915

Spin reprientation transitions of Ni/Cu(001) films during Fe deposition and their origins　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 松村大樹; 北川聡一郎; 渡邊廣憲; 横山利彦; 太田俊明
XAFS討論会, 30 Jul. 2004
20040729, 20040731

XMCD study on spin reorientation transitions of Fe/Ni/Cu(001)　　　　　　　　　　　　　　　
H. Abe; K. Amemiya; D. Matsumura; S. Kitagawa; H. Watanabe; T. Yokoyama; T. Ohta
The Fourteenth International Conference on Vacuum Ultraviolet Radiation Physics (VUV14), 21 Jul. 2004
20040719, 20040723

Spin reorientation transitions of Fe/Ni/Cu(001) magnetic thin films　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 松村大樹; 北川聡一郎; 渡邊廣憲; 横山利彦; 太田俊明
日本物理学会, 30 Mar. 2004
20040327, 20040330

Spin reorientation transitions and their mechanism of Ni/Cu(001) films induced by Fe deposition　　　　　　　　　　　　　　　
Japan Physical Society (Autumn meeting), 2004

Fe deposition induced Spin reorientation transitions of Ni/Cu(001) magnetic thin films　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 松村大樹; 北川聡一郎; 渡邊廣憲; 横山利彦; 太田俊明
XAFS討論会, 26 Sep. 2003
20030925, 20030927

Fe蒸着によるNi/Cu(001)磁性薄膜のスピン再配列　　　　　　　　　　　　　　　
阿部 仁; 雨宮健太; 松村大樹; 北川聡一郎; 渡邊廣憲; 横山利彦; 太田俊明
日本物理学会, 23 Sep. 2003
20030920, 20030923

物理化学III　　　　　　　　　　　　　　　
Apr. 2020 - Present
Ibaraki University

Apr. 2008 - Mar. 2010
慶應義塾大学

Apr. 2008 - Mar. 2010
慶應義塾大学

茨城大学

Fundamental Physics for Chemisry　　　　　　　　　　　　　　　
Chiba University

千葉大学 理学部 化学科

International X-ray Absorption Society

日本化学会

日本表面科学会

日本放射光学会

日本XAFS研究会

日本物理学会

The Chemical Society of Japan

Surface Science Society of Japan

Japan Society for Synchrotron Radiation Research

Japan XAFS Society

Japan Physical Society