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Two-photon excitation cross section in light and intermediate atoms in frozen-core LS-coupling approximationUsing the method of explicit summation over the intermediate states two-photon absorption cross sections in light and intermediate atoms based on the simplistic frozen-core approximation and LS coupling have been formulated. Formulas for the cross section in terms of integrals over radial wave functions are given. Two selection rules, one exact and one approximate, valid within the stated approximations are derived. The formulas are applied to two-photon absorptions in nitrogen, oxygen, and chlorine. In evaluating the radial integrals, for low-lying levels, the Hartree-Fock wave functions, and for high-lying levels, hydrogenic wave functions obtained by the quantum-defect method have been used. A relationship between the cross section and the oscillator strengths is derived.
Document ID
19810025782
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Omidvar, K.
(NASA Goddard Space Flight Center Laboratory for Planetary Atmospheres, Greenbelt, Md., United States)
Date Acquired
August 11, 2013
Publication Date
October 1, 1980
Publication Information
Publication: Physical Review A - General Physics
Subject Category
Atomic And Molecular Physics
Accession Number
81A10186
Distribution Limits
Public
Copyright
Other

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