Researcher Database

（Last updated : 2021-03-31 20:04:17）　

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OHTA Toshiaki

Department / Course Research Organization of Science and Technology

Title / Position Visiting Senior Researcher

Other Affiliations
1.	Research Organization of Science and Technology SR Center

Academic background
1.	～1971/03	Doctoral Program (2nd Semester) │ Department of Chemistry │ Graduate School, Division of Science │ The University of Tokyo │ Completed
2.		│ The University of Tokyo Ph.D. in Science
3.	～1966/03	Department of Chemistry │ Faculty of Science │ University of Tokyo

Business career
1.	2013/04/01	Visiting Professor │ Research Organization of Science and Technology │ Ritsumeikan University
2.	2008/10/01	│ │ Honarable Editor of J. Electron Spectroscopy and Related Phenomena
3.	2006/04/01 ～ 2013/03/31	Eminent Professor │ Research Organization of Science, Technology, │
4.	2000/01/01 ～ 2010/12/31	│ │ Co-Editor of J. Synchrotron Radiation
5.	1998/10/01 ～ 2006/03/31	│ │ Editor of J.Electron Spectroscopy and Related Phenomena
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Committee and society
1.		Japan Society of Synchrotron Radiation Research
2.	2000/01 ～ 2001/12	Japanese Society of Synchrotron Radiation Research President

Research activities
1.		Japanese Chemical Society
2.		Japanese Society of Surface Science
3.		Japanese Physical Society
4.		Japanese Society of Synchrotron Radiation Research

Subject of research
1.	Characterization of function materials by soft X-ray absorption spectroscopy using synchrotron radiation
2.	Development of high resolution infrared microscopy using synchrotron radiation

Research summary
A research on materials science using synchrotron radiation Synchrotron radiation is a powerful light source found in the range from infrared to X-ray and various research projects on physical property have been performed. I have been engaged in the research on electronic structure, atomic structure and magnetic structure by making best use of core electron spectroscopy, particularly such as X‐ray absorption spectroscopy and X‐ray photoelectron spectroscopy by which the radiation in the soft x‐ray region is used as a light source. After I moved to Ritsumeikan University I have been attempting to advance the soft X-ray absorption spectroscopy mainly to apply small size radiation to the industry. In addition, I am developing an infrared microscope using the radiation at the same time and planning to apply it to the evaluation of nanomaterials and biomaterials. [Research Subject (2) Outline]I investigate the atomic structure, electronic state and magnetic property on metal surface using the absorption spectroscopy, photoelectron spectroscopy and XMCD method which use the light in the soft x‐ray region of the radiation and clarify their relationship.

Present specialized field
synchrotron radiation science, surface materials chemistry (Keyword：Synchrotron Radiation, soft X-ray, XAFS, Infrared microscopy,)

Books
1.	2017/07	Foundations and Applications of XAFS
2.	2012/04	Basic Master Series Physical Chemistry │ ,pp.167-201
3.	2005/09	Synchrotron Radiation │ ,pp.1-96
4.	2002/06	X-ray absorption spectroscopy – XAFS and its applications │ ,pp.1-294
5.	2002	Surface XAFS applied to atomic and molecular adsorbates │ ,pp.664-706
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Papers
1.	2018/03	Critically Examining the Role of Nanocatalysts in Li-O2 Batteries: Viability towards Suppression of Recharge Overpotential, Rechargeability and Cyclability │ ACS　Energy Letters │ 3,pp.592-597
2.	2018/03	Nanostructuring one-dimensional and amorphous lithium peroxide for high round-trip efficiency in lithium-oxygen batteries │ Nature Communications │ 9 (680),pp.1-10
3.	2017/12	Impact of the range of voltage change on the electrode/electrolyte interface of layered rock-salt positive electrode materials │ J. Electrochemical Society │ 164,pp.A3848-A3857
4.	2017	Amorphous metal polysulfides: novel electrode materials with unique insertion/extraction reactions │ J. Am Chem. Soc. │ 139 (26),pp.8796-8799
5.	2017	High Capacity Sulfurized Alcohol Composite Positive Electrode Materials Applicable for Lithium Sulfur Batteries │ J. Electrochemical Society │ 164,pp.A6288-A6293
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Message
1.	Applications of synchrotron radiation to materials science In 1979, I moved from Univ. Tokyo to National Laboratory for High Energy Physics to construct the Photon Factory, which was the first big national project for the synchrotron radiation laboratory in Japan. Since then, my life work has been to develop synchrotron radiation-based methods for studying atomic, electronic and magnetic structures of solid surfaces. In 1986, I moved to Hiroshima University, where I was in charge of pushing the HiSOR project. In 1992, I moved back to Univ. Tokyo, Graduate School of Science, Dept. Chemistry and devoted myself in development of new methods, such as the energy-dispersive surface XAFS, energy scanning type photoelectron diffraction method, and depth profiled XMCD method, etc. In 2006, I moved to Ritsumeikan University as a professor of the 21st COE organization, where I am making efforts to enhance the activities of the SR center. From April, 2007, I started the JST project to construct a new beamline for infrared microscopy mainly for industrial usage.