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Excitation of the (2p2)1D and (2s2p)1P autoionizing states of helium by 200 eV electron impact

Lookup NU author(s): Emeritus Professor Albert Crowe

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Abstract

We report full second Born calculations with inclusion of post-collision interactions for excitation of the (2p2)1D and (2s2p)1P autoionizing states of helium by 200 eV electron impact. The calculations are compared to (e, 2e) measurements of McDonald and Crowe (McDonald D. G. and Crowe A. 1993 J. Phys. B: At. Mol. Opt. Phys. 26 2887-97) and Lower and Weigold (Lower J. and Weigold E. 1990 J. Phys. B: At. Mol. Opt. Phys. 23 2819-45). It is shown that post-collision interactions or Coulomb interactions in the final state between the scattered particle, the ejected electron and the recoil ion have a strong influence on both the direct ionization and resonance profiles around the binary lobe. The second-order terms in the amplitude of double electron excitation also play an observable role under these kinematic conditions. Reasonable agreement is found between the full-scale calculations and the experimental data.

Publication metadata

Author(s): Godunov AL, McGuire JH, Schipakov VS, Crowe A

Publication type: Article

Publication status: Published

Journal: Journal of Physics B: Atomic, Molecular and Optical Physics

Year: 2002

Volume: 35

Issue: 12

Pages: L245-L251

ISSN (print): 0953-4075

ISSN (electronic): 1361-6447

Publisher: Institute of Physics Publishing Ltd.

URL: http://dx.doi.org/10.1088/0953-4075/35/12/101

DOI: 10.1088/0953-4075/35/12/101

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