Original scientific paper

The role of electron correlations in the process of photoabsorption of the lightest atoms

Muhambd Busuladžić ; Department of Physics, Faculty of Science, University oj Sarajevo, 71000 Sarajevo, Yugoslavia
Nikolaj A. Cherepkov ; A. F. Ioffe Physical-Technical Institute of the Academy of Sciences of USSR, 194021 Leningrad, USSR
Vojislav Radojević ; Department of Physics, College of Science, University of Notre Dame, Notre Dame, Indiana 46556, USA
Đorđe Živanović ; Department of Physics, Faculty of Science, University of Belgrade, 11000 Belgrade, Yugoslavia

Abstract

The contribution of diagrams of different order for the photoionization cross section and the oscillator strengths at the atoms of He, Li and Be in the framework of the Random Phase Approximation with Exchange (RPAE) is considered. The diagrams of the lowest order are shown to have the dominant role. This explains why the dense electron gas model deals equally well with electron correlations at lightest atoms as the rare electron gas model does. The dipole matrix element in the RPAE, developed in the series, is shown to have good convergence. The contribution of the exclusion principle violating (EPV) diagrams is, calculated.

Keywords

Hrčak ID:

329092

URI

https://hrcak.srce.hr/329092

Publication date:

9.1.1984.

Article data in other languages: croatian

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