2sphotoionization and subsequent Auger cascade in atomic Si
| Autor: | Marko Huttula, Helena Aksela, Seppo Aksela, Kari Jänkälä, S. Osmekhin, Samuli Urpelainen, L. Partanen, Stephan Fritzsche |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Physical Review A. 81 |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.81.062513 |
| Popis: | 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) |
| Databáze: | OpenAIRE |
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