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2s photoionization and subsequent Auger cascade in atomic Si

Partanen, L.; Fritzsche, S.; Jankala, K.; Huttula, M.; Urpelainen, Samuli LU ; Osmekhin, S.; Aksela, H. and Aksela, S. (2010) In Physical Review A (Atomic, Molecular and Optical Physics) 81(6).
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review A (Atomic, Molecular and Optical Physics)
volume
81
issue
6
publisher
American Physical Society (APS)
external identifiers
  • wos:000279262000003
  • scopus:77954189101
ISSN
1050-2947
DOI
10.1103/PhysRevA.81.062513
language
English
LU publication?
yes
id
4e9daf40-fd9a-4305-8157-0325c82df956 (old id 1628727)
date added to LUP
2010-07-21 16:31:18
date last changed
2018-05-29 11:22:15
@article{4e9daf40-fd9a-4305-8157-0325c82df956,
  abstract     = {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.},
  author       = {Partanen, L. and Fritzsche, S. and Jankala, K. and Huttula, M. and Urpelainen, Samuli and Osmekhin, S. and Aksela, H. and Aksela, S.},
  issn         = {1050-2947},
  language     = {eng},
  number       = {6},
  publisher    = {American Physical Society (APS)},
  series       = {Physical Review A (Atomic, Molecular and Optical Physics)},
  title        = {2s photoionization and subsequent Auger cascade in atomic Si},
  url          = {http://dx.doi.org/10.1103/PhysRevA.81.062513},
  volume       = {81},
  year         = {2010},
}