2s photoionization and subsequent Auger cascade in atomic Si

Journal Article · Tue Jun 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.062513· OSTI ID:21437889

Partanen, L; Fritzsche, S; Jaenkaelae, K; Huttula, M; Osmekhin, S; Aksela, H; Aksela, S ^[1]; Urpelainen, S ^[1]

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1. Department of Physics, University of Oulu, P. O. Box 3000, 90014 University of Oulu (Finland)

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{sup +} atoms to Si{sup 3+} ions were observed by measuring the conventional Auger electron spectra of the L{sub 1}-L{sub 2,3}M Coster-Kronig transitions and the L{sub 2,3}M-MMM Auger transitions. The observed L{sub 1}-L{sub 2,3}M and L{sub 2,3}M-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 L{sub 2,3}M-MMM spectrum. Additionally, it was seen that the L{sub 2,3}M-MMM Auger spectrum of Si includes more Auger groups than the isoelectronic L{sub 2,3}-MM Auger 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.

• OSTI ID: 21437889
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOMS
AUGER EFFECT
AUGER ELECTRON SPECTROSCOPY
BREMSSTRAHLUNG
CALCULATION METHODS
CHARGED PARTICLES
COLLISIONS
CORRELATIONS
COSTER-KRONIG TRANSITIONS
ELECTROMAGNETIC RADIATION
ELECTRON CORRELATION
ELECTRON SPECTRA
ELECTRON SPECTROSCOPY
ENERGY-LEVEL TRANSITIONS
HOLES
IONIZATION
IONS
PHOTOIONIZATION
PHOTON COLLISIONS
PHOTON-ATOM COLLISIONS
RADIATIONS
SILICON IONS
SPECTRA
SPECTROSCOPY
SYNCHROTRON RADIATION