Measurement of the cross section for electron-impact ionization ofions
- 1 May 1983
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 27 (5), 2338-2341
- https://doi.org/10.1103/physreva.27.2338
Abstract
The absolute cross section for electron-impact ionization of has been measured from below threshold to 1500 eV with the Oak Ridge National Laboratory crossed-beams apparatus. Excitation of inner-shell electrons to autoionizing states is found to contribute up to a factor of 10 more than direct processes to the single-ionization cross section, and indirect effects dominate the measurement over the entire energy range studied. Good agreement is found with distorted-wave excitation calculations added to Lotz direct-ionization predictions.
Keywords
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