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Type: Journal article
Title: Exchange effects in low energy electron impact ionization of the inner and outer shells of argon
Author: Biava, D. A.
Saha, H. P.
Engel, E.
Dreizler, R. M.
McEachran, R. P.
Haynes, Matthew A.
Lohmann, Birgit
Whelan, Colm T.
Madison, Don H.
Citation: Journal of Physics B, 2002; 35(2):293-307
Publisher: IOP Publishing
Issue Date: 2002
ISSN: 0953-4075
School/Discipline: School of Chemistry and Physics : Chemistry
Abstract: First order distorted wave Born approximation (DWBA) triple differential cross sections are reported for low-energy electron-impact ionization of the inner 3s and outer 3p shells of argon. Previous DWBA works have demonstrated that experiment and theory are not in accord for low energy ionization of inert gases and here we investigate the importance of exchange scattering. Different approximations for treating exchange scattering are investigated. It is shown that exchange scattering is particularly important for 3s ionization. Even with a proper treatment of exchange, the first order calculations are still not in satisfactory agreement with experiment. Consequently higher order effects will have to be included to achieve a satisfactory description of the low-energy ionization process. We also investigated both the Hartree-Fock and optimized potential methods for calculating atomic wavefunctions and static potentials and found that both methods produced almost the same cross sections.
Rights: © Institute of Physics and IOP Publishing Limited 2007
RMID: 0020073138
DOI: 10.1088/0953-4075/35/2/308
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Appears in Collections:Physics publications

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