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Citation 7

Accession Number

004618792

Author

Kheifets A.

Institution

Electron. Structure of Mater. Centre, Sch. of Phys. Sci., Flinders Univ. of
South Australia, Adelaide, SA, Australia.

Editor

Wheelan CT; Walters HRJ; Lahmam-Bennani A; Ehrhardt H.

Title

Multiconfiguration Hartree-Fock calculation of the autoionization resonance
parameters in the (e,2e) reaction on helium atom.

Source

(e, 2e) and Related Process. Proceedings of the NATO Advanced Research
Workshop. Kluwer Academic Publishers. 1993, pp.281-95. Dordrecht,
Netherlands.

Conference Information

Cambridge, UK. 28 Sept.-1 Oct. 1992.

Abstract

The autoionization a and b parameters as functions of ejected electron angle have been calculated for the helium (2s/sup 2/)/sup 1/S,(2s2p)/sup 1/P and (2p/sup 2/)/sup 1/D resonances in the coplanar nonsymmetric (e,2e) reaction at the incoming electron energy/scattering angle of 400 eV/16 degrees , 200 eV/13 degrees and 100 eV/13 degrees . Multiconfiguration Hartree-Fock calculations of the resonances as well as of the helium ground state have been performed. Distorted wave Born approximation with exchange has been used for the (e,2e) cross-section calculation with distorted waves being calculated in the Hartree-Fock field of the helium neutral atom or positive ion. Calculated parameters agree well with experimental 400 eV/16 degrees data whereas only a qualitative resemblance exists for 200 eV/13 degrees and 100 eV/13 degrees kinematics. (21 References).

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