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2s photoionization and subsequent Auger cascade in atomic Si

In English

Författare

  • L. Partanen
  • S. Fritzsche
  • K. Jankala
  • M. Huttula
  • Samuli Urpelainen
  • S. Osmekhin
  • H. Aksela
  • S. Aksela

Summary, in English

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.

Publiceringsår

2010

Språk

Engelska

Publikation/Tidskrift/Serie

Physical Review A (Atomic, Molecular and Optical Physics)

Volym

81

Issue

6

Dokumenttyp

Artikel i tidskrift

Förlag

American Physical Society

Ämne

  • Natural Sciences
  • Physical Sciences

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1050-2947