The role of multiple ionization and subshell coupling effects in L-shell ionization of Au by oxygen ions

D. Banas, J. Braziewicz, M. Pajek, J. Semaniak, T. Czyzewski, I. Fijal, M. Jaskóla, W. Kretschmer, T. Mukoyama, D. Trautmann

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15 Citations (Scopus)

Abstract

The ionization of L-subshell electrons in gold by the impact of 0.4-2.2 MeV amu-1 O ions was studied by observing excited Lγ(L-N, O) x-rays. We demonstrate that both the multiple ionization in outer M- and N-shells as welt as the coupling effects in the L-shell play an important role in understanding the measured L-subshell ionization cross sections. The multiple ionization was found to be important in two aspects: first, the analysis of x-ray energy shifts and line broadening was crucial for proper interpretation of measured x-ray spectra; second, the additional vacancies in the M- and N-shells substantially influenced the L1-subshell fluorescence and Coster-Kronig (CK) yields, mainly by closing strong L1-L3M4,5 CK transitions. The data are compared with the simplified coupled-channels calculations using the 'coupled-subshell model' (CSM) based on the semiclassical approximation (SCA), which describes both direct Coulomb ionization as well as the L-subshell couplings within the same theoretical approach. A good agreement of the present data with the theoretical predictions based on the discussed SCA-CSM approach is observed. Present findings partly explain the long-standing problem of inadequate theoretical description of L-shell ionization by heavy ion impact.

Original languageEnglish
Pages (from-to)3421-3433
Number of pages13
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume35
Issue number16
DOIs
Publication statusPublished - Aug 28 2002

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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    Banas, D., Braziewicz, J., Pajek, M., Semaniak, J., Czyzewski, T., Fijal, I., Jaskóla, M., Kretschmer, W., Mukoyama, T., & Trautmann, D. (2002). The role of multiple ionization and subshell coupling effects in L-shell ionization of Au by oxygen ions. Journal of Physics B: Atomic, Molecular and Optical Physics, 35(16), 3421-3433. https://doi.org/10.1088/0953-4075/35/16/305