Many-body calculation on the photoionization of neon and argon isoelectronic sequences

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Abstract
This paper presents the results of a calculation on the photoionization of Ne and Ar isoelectronic sequences based on a recently developed many-body theory of atomic transitions. Within this theoretical approach, one is able to concentrate attention on studies of the systematics of various many-body effects and of their implications for the photoionization process along isoelectronic sequences. The transition-matrix elements obtained with different degrees of approximation are given in detail. The photoionization cross sections and the asymmetry parameter representing the photoelectron angular distribution are also given. In addition, this study indicates that the usual effective ionization mechanism for the neutral atom, namely, the direct ionization of the outer-shell electron at relatively low energies, becomes ineffective for the ion systems as the degree of ionization increases along the isoelectronic sequence.