2017 Fiscal Year Research-status Report
Post Collision Interaction and photoelectron recapture upon atomic and molecular photoionization
| Project/Area Number |
17K05600
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| Research Institution | Sophia University |
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Principal Investigator |
東 善郎 上智大学, 理工学部, 教授 (50270393)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Keywords | PCI / Auger electron / Synchrotron radiation / Photoionization |
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| Outline of Annual Research Achievements |
Experiments on postcollision interaction effects were condected on rare gases, utilizing synchrotron radiation combined with Auger electron measurements utilizing high resolution hemispherical analyzers. In particular, photoexcitations with relatively high energy photons for inner-shell photoionization were pursued. The actual measurements were conducted at the SPring8 synchrotron radiation facility at Harima, Japan, as well as the SOLEIL synchrotron radiation facility in France. The experiment in France was conducted in collaboration with the group at Sorbonne University led by Prof. Marc Simon.
These were the first attempts on post-collision interaction measurments where multiple auger processes occur. It is also combined with fluorescent decay. The new findings have been that
1. The PCI effect affects each auger channels fairly separately.
2. In case fluorescence occurs in the first step, very little PCI effect was seen on the electron channel. Apparently all the PCI energy excess gets absorbed by the shift in the fluorescence energy. This effect was particularly clearly seen on the LMM measurements of Kr upon K-shell excitations.
In addition to experimental activities, Meaningful discussions with theorists were conducted at international conferences in Australia and in India.
A workshop was organized in France in collaboration with Marc Simon of Sorbonne Univ.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
Early in the fiscal year, we established strong contact with theorists interested in our topic. We also managed to associate with Prof. Marc Simon of Sorbonne Univ., who later in the year, helped manage our experiments at the Soleil facility in France in addition to organizing a workshop together. Altogether, we managed four beamtimes during the year and accumulated a large amount of data. Analysis of the results revealed new findings including the sharing of PCI excess energies among Auger electrons and fluorescence energies.
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| Strategy for Future Research Activity |
Analysis of the current data and publications will be pursued. Further experimental measurements will continue at the SPring8 (Japan) and SOLEIL (France) facilities. New samples will include Ne for its simplicity, and Xe to investigate cases where the fluorescence channel becomes very dominant. We are currently in the process of negotiating an experiment at the MAXLAB Max4 facility in Sweden, which has the most ideal characteristics for the Ne experiment. Marc Simon of Sorbonne Univ. will visit Japan in late summer. We plan to take the opportunity to organize a workshop sequel to the one held in Paris last summer.
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| Causes of Carryover |
Some unexpected reduction in the travel expenses during the fiscal year.
The incurring fund will be used for travel expenses during the next fiscal year.
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