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Postcollision interaction effects in KLL Auger spectra following argon 1s photoionization
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2015 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 92, no 1, 012503Article in journal (Refereed) Published
Abstract [en]

Postcollision interaction effects on the Auger decay of a deep core hole are studied both experimentally and theoretically. KL2,L-3(2),(3) decay spectra of the Ar 1s vacancy are measured with high-energy resolution with excess photon energies ranging from 0 to 200 eV above the ionization threshold. Interaction of the Auger electron with the photoelectron and the ion field manifests itself in the Auger spectra as a distortion of the energy distribution of the Auger electron close to threshold. Moreover, recapture of the photoelectron due to energy exchange is dominating in the low-photon-energy range above threshold. The experimental results are compared with calculations based on the semiclassical approach to the postcollision interaction. The energies of the discrete levels and individual recapture cross sections are computed in the Hartree-Fock approximation. Good agreement is found between the calculated and experimental spectra, validating the model used.

Place, publisher, year, edition, pages
2015. Vol. 92, no 1, 012503
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:uu:diva-259655DOI: 10.1103/PhsRevA.92.012503ISI: 000357481400007OAI: oai:DiVA.org:uu-259655DiVA: diva2:847521
Available from: 2015-08-20 Created: 2015-08-10 Last updated: 2015-08-20Bibliographically approved

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Piancastelli, Maria Novella
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Molecular and condensed matter physics
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