Many-electron correlations in computations of sodium atom photoabsorption

The role of many-electron correlations in photoabsorption processes has been investigated. The results of numerical computations of photoionization cross sections of sodium atom are presented. The many-body effects such as interchannel correlations resulting in autoionization resonance peaks, as wel...

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Bibliographic Details
Published inSt. Petersburg Polytechnical University Journal. Physics and Mathematics Vol. 2; no. 1; pp. 54 - 62
Main Authors Konovalov, Alexey V., Ipatov, Andrey N.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.2016
Subjects
Dyson equation
Photoabsorption cross section
RPAE
Sodium atom
Dyson equation
RPAE
Sodium atom
Photoabsorption cross section
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Summary:The role of many-electron correlations in photoabsorption processes has been investigated. The results of numerical computations of photoionization cross sections of sodium atom are presented. The many-body effects such as interchannel correlations resulting in autoionization resonance peaks, as well as effects of atomic core polarization were taken into account in the computations in terms of RPAE. Polarization corrections were accounted for using both static and dynamic polarization potentials. The influence of correlations on the position and the form of resonance peaks was studied. The obtained results demonstrate necessity of taking into account polarization effects, especially for clarification of autoionization resonance peaks position and the cross-section magnitudes in the low energy range. The best agreement with experimental data was reached with the model of dynamic polarization potential based on Dyson equation.
ISSN:2405-7223
2405-7223
DOI:10.1016/j.spjpm.2016.02.008