Hartree-Fock treatment of exchange in (e, 2e) collisions

    Authors

    K. D. Winkler; D. H. Madison;H. P. Saha

    Comments

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    Abbreviated Journal Title

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

    Keywords

    ELECTRON-IMPACT IONIZATION; COPLANAR SYMMETRICAL GEOMETRY; SPIN-POLARIZED ELECTRONS; E, 2E COLLISIONS; INTERMEDIATE ENERGIES; CROSS-SECTIONS; SCATTERING; ATOMS; XENON; ARGON; Optics; Physics, Atomic, Molecular & Chemical

    Abstract

    The distorted-wave Born approximation has been very successful for treating electron-impact ionization (e, 2e) of heavy atoms for high-energy incident electrons. However, as the energy of the incident electrons approaches threshold, significant differences between experiment and theory are observed. In these calculations, the continuum projectile electron wavefunction is typically calculated using the static field of the atom plus a local approximation for electron exchange. While this approximation is believed to be reasonable for higher energies, it is likely to become unreliable for energies near threshold. Here we report a proper treatment of electron exchange in which a full Hartree-Fock calculation is performed for both the atomic and projectile electrons. For the initial stare, the projectile orbitals are calculated in the Hartree-Fock approximation with full exchange with the target electrons and for the final state, the Hartree-Fock continuum orbitals are computed for an ion. It is found that the static-exchange approximation is not valid for lower incident energy projectiles.

    Journal Title

    Journal of Physics B-Atomic Molecular and Optical Physics

    Volume

    32

    Issue/Number

    19

    Publication Date

    1-1-1999

    Document Type

    Article

    Language

    English

    First Page

    4617

    Last Page

    4626

    WOS Identifier

    WOS:000083235300008

    ISSN

    0953-4075

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