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2s photoionization and subsequent Auger cascade in atomic Si

  • L. Partanen
  • S. Fritzsche
  • K. Jankala
  • M. Huttula
  • Samuli Urpelainen
  • S. Osmekhin
  • H. Aksela
  • S. Aksela
Publiceringsår: 2010
Språk: Engelska
Publikation/Tidskrift/Serie: Physical Review A (Atomic, Molecular and Optical Physics)
Volym: 81
Nummer: 6
Dokumenttyp: Artikel i tidskrift
Förlag: American Physical Society (APS)


The 2s photoionization and subsequent Auger transition cascade in atomic Si were studied by means of synchrotron-radiation-induced electron spectroscopy. After the 2s photoionization, the core hole states decay predominantly by a two-step Auger transition cascade into the triply ionized [Ne]nl states. The ionization channels of the 2s core-ionized Si+ atoms to Si3+ ions were observed by measuring the conventional Auger electron spectra of the L-1-L2,3M Coster-Kronig transitions and the L2,3M-MMM Auger transitions. The observed L-1-L2,3M and L2,3M-MMM Auger spectra were analyzed by means of extensive multiconfiguration Dirac-Fock computations. We found that the electron correlation plays a prominent role in the Auger cascade, especially for the final-step Auger L2,3M-MMM spectrum. Additionally, it was seen that the L2,3M-MMM Auger spectrum of Si includes more Auger groups than the isoelectronic L-2,L-3-MMAuger spectrum of Al. Thus, more information on the intermediate ionic states is obtained if they are produced by Auger cascade rather than by direct photoionization.


  • Natural Sciences
  • Physical Sciences


  • ISSN: 1050-2947

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