2003 Fiscal Year Final Research Report Summary
STUDY OF THE ELECTRONIC STATE OF THE MANGANESE CLUSTER IN PHOTOSYSTEM II : AN APPROACH BY SOFT X-RAY EMISSION SPECTROSCOPY
| Project/Area Number |
14540386
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
物理学一般
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| Research Institution | RIKEN (The Institute of Physical and Chemical Research) |
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Principal Investigator |
HARADA Yoshihisa RIKEN (The Institute of Physical and Chemical Research), QUANTUM ELECTRONIC MATERIALS RESEARCH TEAM, CONTRACT RESEARCHER, 量子電子材料研究チーム, 連携研究員 (70333317)
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| Co-Investigator(Kenkyū-buntansha) |
KUSUNOKI Masami MEIJI UNIVERSITY, SCHOOL OF SCIENCE & TECHNOLOGY, PROFESSOR, 理工学部, 教授 (30061998)
SUGIURA Miwa OSAKA PREFECTURE UNIVERSITY, COLLEGE OF AGRICULTURE, ASSISTANT, 農学部, 助手 (80312255)
TAKATA Yasutaka SOFT X-RAY SPECTROSCOPY LABORATORY, SENIOR RESEARCHER, 放射光物性研究室, 先任研究員 (90261122)
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| Project Period (FY) |
2002 – 2003
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| Keywords | SOFT X-RAY EMISSION / SOFT X-RAY ABSORPTION / LIQUID CELL / MANGANESE CLUSTER |
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| Research Abstract |
The purpose of this study was to perform Mn 2p soft x-ray absorption/emission measurement of the oxygen evolving complex, manganese cluster, in photosystem II. In order to apply soft x-ray absorption/emission measurement which is limited to a solid system or gas system, to a system in solution, we have improved the following three points:
1.Development of the soft X-ray emission spectrometer --balancing high energy resolution and high detection efficiency--
It has become possible to measure the soft x-ray emission from a monolayer adsorbed on a substrate in only 30 minites, with the energy resolution of 1000(E/ΔE).
2.Development of a solution cell with Si_3N_4 membrane to hold a solution in an ultra high vacuum
We have succeeded to maintain about 2μl solution sample between two Si plates with Si3N4 thin films of 200nm thickness using a sealant compatible for ultra high vacuum.
We used this cell to measure Fe 2p soft x-ray absorption and emission measurement of a stable and dense (-10mM) myoglobin.
3.Development of a sample scanning system to reduce radiation damage
We have developed a sample scanning system using the solution cell. However, an opening area toward soft x-rays required for control of a sample position and the opening area restricted for a vacuum-proof did not suit well, so we have given up the scanning of the sample position during measurements. Instead, we have developed a bulk sensitive spectrometer, a high energy photoemission spectrometer, to place a solution sample in a low vacuum.
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Research Products
(16 results)
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[Publications] Y.Takata, T.Tokushima, Y.Harada, N.Kamakura, Y.Kitajima, M.Nagasono, Y.Tamenori, H.Ohashi, A.Hiraya, H Ishiguro, S Shin: "A UHV Apparatus for Soft X-Ray Spectroscopy with Symmetry Selection for Solids and Surfaces"AIP conference proceedings. 705. 1186-1189 (2004)
Description
「研究成果報告書概要(和文)」より
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[Publications] Y.Takata, K.Tamasaku, T.Tokushima, D.Miwa, S.Shin, T.Ishikawa, M.Yabashi, K.Kobayashi, J.J.Kim, T.Yao, T.Yamamoto, M.Arita, H.Namatame, M.Taniguchi: "A probe of intrinsic valence band electronic structure : Hard x-ray photoemission"Applied Physics Letters. 84. 4310-4312 (2004)
Description
「研究成果報告書概要(和文)」より
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[Publications] Y.Ishiwata, M.Watanabe, R.Eguchi, T.Takeuchi, Y.Harada, A.Chainani, S.Shin, T.Hayashi, Y.Hashimoto, S Katsumoto, Y.lye: "Manganese concentration and low-temperature annealing dependence of Ga_<1-x>Mn_xAs by x-ray absorption spectroscopy"Physical Review B. 65. 233201-1-233201-4 (2002)
Description
「研究成果報告書概要(和文)」より
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[Publications] Y.Takata, T.Tokushima, Y.Harada, N.Kamakura, Y.Kitajima, M.Nagasono, Y.Tamenori, H.Ohashi, A.Hiraya, B.Ishiguro, S.Shin: "GA UHV Apparatus for Soft X-Ray Spectroscopy with Symmetry Selection for Solids and Surfaces"AIP conference proceedings. 705. 1186-1189 (2004)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Y.Takata, K.Tamasaku, T.Tokushima, D.Miwa, S.Shin, T.Ishikawa, M.Yabashi, K.Kobayashi, J.J.Kim, T.Yao, T.Yamamoto, M.Arita, H.Namatame, M.Taniguchi: "A probe of intrinsic valence band electronic structure : Hard x-ray photoemission"Applied Physics Letters. 84. 4310-4312 (2004)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Y.Ishiwata, M.Watanabe, R.Eguchi, T.Takeuchi, Y.Harada, A.Chainani, S.Shin, T.Hayashi, Y.Hashimoto, S.Katsumoto, Y.Iye: "Manganese concentration and low-temperature annealing dependence of Ga_<1-x>Mn_xAs by x-ray absorption spectroscopy"Physical Review B. 65. 233201-1-233201-4 (2002)
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「研究成果報告書概要(欧文)」より
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