Electron-impact double ionization of rare-gas ions
- 1 April 1984
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 29 (4), 1749-1756
- https://doi.org/10.1103/physreva.29.1749
Abstract
Cross sections for the removal of two electrons from rare-gas ions by single collisions with incident electrons have been both measured using crossed beams of ions and electrons, and calculated using Hartree-Fock distorted-wave theory. For initial ions , , and the measured peak cross sections are 1.4 × , 6.5 × , respectively. These measurements confirm and extend the measurements of Müller and Frodl and of Achenbach et al. Calculations were performed for the charge-state-4 + ions and for , , and . Comparison of experiment and theory indicates that the double ionization of rare-gas ions is dominated by the indirect mechanism of inner-shell single ionization followed by autoionization. The distorted-wave calculations for the ionization cross section of ions are strongly influenced by term dependence in the ejected-electron continuum, and by ground-state correlations.
Keywords
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