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A simple correction for the Born approximation for electron impact excitation of hydrogenic ionsAn analytic procedure is developed for obtaining the electron impact excitation cross sections for hydrogenic ions. A simple modification of the Born approximation, in order to include Coulomb focusing of the continuum wave functions, produces the correct energy dependence of the cross section near excitation threshold. This procedure is used to compute the 1s yields 2s and 1s yields 2p excitation cross sections for hydrogenic ions (Z approaches infinity), and compare these modified-Born cross sections with numerical Colomb-Born calculations. The modified-Born cross sections agree well with the Coulomb-Born cross sections and thus provide a reliable generalized analytic expression for electron impact excitation of hydrogenic ions. By treating effective charges, the results in this work can be extended to nonhydrogenic target systems.
Document ID
19920071757
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Jung, Young-Dae
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 15, 2013
Publication Date
September 10, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 396
Issue: 2, Se
ISSN: 0004-637X
Subject Category
Atomic And Molecular Physics
Accession Number
92A54381
Distribution Limits
Public
Copyright
Other

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