, Y.
, Johnson, W.
and Rudd, M.
(2000),
Cross Sections for Singly Differential and Total Ionization of Helium by Electron Impact, Physical Review A (Atomic, Molecular and Optical Physics)
(Accessed May 9, 2025)
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Cross Sections for Singly Differential and Total Ionization of Helium by Electron Impact
Published
Author(s)
, W R. Johnson, M E. Rudd
Abstract
The Binary-Encounter Dipole (BED) model for electron-impact ionization is applied to helium using the continuum dipole oscillator strength calculated from the relativistic random-phase approximation. The resulting total ionization cross section agrees with available experimental data within the quoted experimental uncertainties. The singly differential (=energy distribution of ejected electrons) cross section agrees well in shape with available experiments. Because of the remarkable agreement with experiment at all incident and ejected electron energies and the compact analytic form of the cross sections, we propose that the BED cross sections for helium serve as a normalization standard with an accuracy of {plus or minus}5% from the threshold to 1 keV the primary electron energy.Citation
Physical Review A (Atomic, Molecular and Optical Physics)
Volume
61
Issue
No. 3
Pub Type
Journals
Keywords
differential ionization cross section, helium atom, total ionization cross section
Citation
Issues
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Created March 1, 2000, Updated June 2, 2021