Exchange effects in low energy electron impact ionization of the inner and outer shells of argon

    Authors

    D. A. Biava; H. P. Saha; E. Engel; R. M. Dreizler; R. P. McEachran; M. A. Haynes; B. Lohmann; C. T. Whelan;D. H. Madison

    Comments

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    Abbreviated Journal Title

    J. Phys. B-At. Mol. Opt. Phys.

    Keywords

    DIFFERENTIAL CROSS-SECTIONS; SPIN-POLARIZED ELECTRONS; E, 2E COLLISIONS; INTERMEDIATE ENERGIES; 2E; ATOMS; XENON; DENSITY; NEON; SCATTERING; Optics; Physics, Atomic, Molecular & Chemical

    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.

    Journal Title

    Journal of Physics B-Atomic Molecular and Optical Physics

    Volume

    35

    Issue/Number

    2

    Publication Date

    1-1-2002

    Document Type

    Article

    Language

    English

    First Page

    293

    Last Page

    307

    WOS Identifier

    WOS:000173772700010

    ISSN

    0953-4075

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