| Project/Area Number |
12440115
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Okazaki National Research Institutes |
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Principal Investigator |
SHIGEMASA Eiji ONRI, IMS, Associate Professor, 分子科学研究所, 助教授 (90226118)
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| Co-Investigator(Kenkyū-buntansha) |
KOSUGI Nobuhiro ONRI, IMS, Professor, 分子科学研究所, 教授 (20153546)
GEJO Tatsuo ONRI, IMS, Research Associate, 分子科学研究所, 助手 (20290900)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥13,700,000 (Direct Cost: ¥13,700,000)
Fiscal Year 2002: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2001: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2000: ¥9,800,000 (Direct Cost: ¥9,800,000)
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| Keywords | Core-excitation / Synchrotron / Auger decay / Dissociation / Nuclear motion / Polarization dependence / Vector correlation / Reaction dynamics |
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| Research Abstract |
This work intends to cover an important and hot topic in the research field of molecular soft X-ray spectroscopy, in which the decay dynamics following core-electron excitation as well as core-electron ionization for molecules has been extensively studied over the past two decades, which is related to the relaxation dynamics of core-excited molecules. As is widely recognized, the multi-coincidence technique is a powerful tool to investigate state-to-state dissociation dynamics following the core-hole creation. However, many experimental apparatuses previously developed for such investigations were not so close to satisfaction, because each of them has a certain limitation for its application. The new apparatus developed here is a natural enlargement of the capability of the world-famous EPICEA II developed at LURE, Orsay, France, by introducing two two-dimensional detectors with sufficiently fast response, both to electron and ion detections. A great deal of effort has been put into designing a new electrostatic analyzer with a double toroidal shape, in order to satisfy spatial focusing condition for determining the initial momenta of electrons or ions. The result of the performance tests for the analyzer performed at a newly constructed beamline BL4B of the UVSOR facility clearly indicate that further improvements are strongly desired even for the simple electron spectroscopy. The recent results obtained at LURE using a new apparatus developed with the similar concepts as we have, show directly the significant role of the molecular geometry deformation of the core-excited states in H2O and CO2, which induces to specific fragmentation channels. This kind of work is exactly what we would like to perform after the development of the present experimental setup, and gives us an impetus for future improvement of our system. A new time-of-flight mass spectrometer with a two-dimensional detector will be developed and introduced to our experimental setup in the near future.
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