Post Collision Interaction and photoelectron recapture upon atomic and molecular photoionization

2019 Fiscal Year Annual Research Report

• Project/Area Number: 17K05600
• Research Institution: Sophia University
• Principal Investigator: 東 善郎 上智大学, 理工学部, 教授 (50270393)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: PCI / photoionization / Auger spectroscopy / photoelectron recapture

Outline of Annual Research Achievements

The final fiscal year was spent mostly on the analysis of the data obtained at synchrotron radiation facilities during the previous two years as well as theoretical calculations and the writing of papers. Significant achievements were made in discovering and proving that very prominent exchange of angular momenta between the auger electron and photoelectron occurs during the PCI and recapture processes. Large variations of angular distributions of auger electrons depending on the quantum number of the recapture Rydberg orbital were found, further attesting to the importance of angular correlation in PCI. Also, new insight into the time-dependent dynamics of multistep auger processes including fluorescence, in effect leading to an effective clock mechanism. This result was backed up by our state-of-the-art theoretical calculations. This was a remarkable result probing 100 as time-scale, on a par with XFEL experiments, by utlizing synchrotron beamline with standard electron spectroscopy, We managed to publish four papers on refereed journals and have produced two more nearly completed manuscripts in addition.

Research Products

• [Int'l Joint Research] Sorbonne University/Synchrotron SOLEIL(フランス)
  • Country Name: FRANCE
  • Counterpart Institution: Sorbonne University/Synchrotron SOLEIL
• [Int'l Joint Research] University College, Dublin(アイルランド)
  • Country Name: IRELAND
  • Counterpart Institution: University College, Dublin
• [Int'l Joint Research] Uppsala University(スウェーデン)
  • Country Name: SWEDEN
  • Counterpart Institution: Uppsala University
• [Int'l Joint Research] Helmholtz-Institut Jena(ドイツ)
  • Country Name: GERMANY
  • Counterpart Institution: Helmholtz-Institut Jena
• [Journal Article] Conjugate photoelectron recapture peaks in the high resolution Auger electron spectra following near-threshold Ar 2p photoionization (2020)
  • Author(s): S Kosugi, J Martins, F Hosseini, T Marchenko, O Travnikova, J D Bozek, K Ito, E Sokell, M N Piancastelli, M Simon, F Koike and Y Azuma
  • Journal Title: Journal of Physics B: Atomic, Molecular and Optical Physics Volume: 53 Pages: 125001
  • DOI: https://doi.org/10.1088/1361-6455/ab7fc1
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Fluorescence Time Delay in Multistep Auger Decay as an Internal Clock (2020)
  • Author(s): S. Kosugi, F. Koike, M. Iizawa, M. Oura, T. Gejo, K. Tamasaku, J.R. Harries, R. Guillemin, M.N. Piancastelli, M. Simon, and Y. Azuma
  • Journal Title: PHYSICAL REVIEW LETTERS Volume: 124 Pages: 183001
  • DOI: https://doi.org/10.1103/PhysRevLett.124.183001
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Strong configuration interaction in the 3 p photoelectron spectrum of Kr (2020)
  • Author(s): S. Kosugi, F. Koike, T. Nagayasu, F. Hosseini, J. Martins, T. Marchenko, O. Travnikova, M. Oura, T. Gejo, J. R. Harries, J. D. Bozek, K. Ito, E. Sokell, S. Fritzsche, M. N. Piancastelli , M. Simon and Y. Azuma
  • Journal Title: PHYSICAL REVIEW A Volume: 101 Pages: 042505
  • DOI: https://doi.org/10.1103/PhysRevA.101.042505
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Dominance of angular momentum exchange in the PCI recapture of photoelectrons revealed by high resolution Auger electron measurements of Kr (2019)
  • Author(s): S Kosugi, N Suzuki, N Kumagai, H Iwayama, E Shigemasa, F Koike and Y Azuma
  • Journal Title: Journal of Physics B: Atomic, Molecular and Optical Physics Volume: 52 Pages: 245002
  • DOI: https://doi.org/10.1088/1361-6455/ab4c1a
  • Peer Reviewed