Calculation of multiphoton-ionization Green’s functions using the Wentzel-Kramers-Brillouin approximation. II

Document Type

Article

Publication Date

6-10-1992

Publication Title

Physical Review A

DOI

10.1103/PhysRevA.46.7228

ISSN

2469-9934

Abstract

Recently, a technique [M. Edwards, Phys. Rev. A 45, 409 (1992)] was presented for calculating multiphoton-ionization Green’s functions based on the Wentzel-Kramers-Brillouin (WKB) approximation. In that paper it was shown that the ability of this method to produce accurate cross sections and angular distributions depended critically on the single-particle potential for the valence electron that was used in the calculation. In this work we present a supporting technique for determining the optimal potential for use with this method in low-Z alkali-metal atoms. The technique produces the parameter values for a parametric model potential whose WKB Green’s function has poles that coincide with the measured energy levels of the atom. We have determined the parameter values for a specific model potential in Li and Na. For these cases, only two parameters are needed to produce a potential whose WKB energy levels match all of the measured ones to within 165 cm−1. We have calculated cross sections for two-photon ionization of Li and Na for a range of laser-photon energies using this model potential and present comparisons with previous work.

Comments

Authors have the right to use all or part of the Article, including the APS-prepared version without revision or modification, on the author(s)’ web home page or employer’s website. (source: http://journals.aps.org/authors/transfer-of-copyright-agreement) Article obtained from Physical Review A.

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