Electron-impact ionization ofand
- 1 February 1982
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 25 (2), 737-748
- https://doi.org/10.1103/physreva.25.737
Abstract
Absolute cross sections for electron-impact ionization of and have been measured from below threshold to 2 keV with the use of the crossed-charged-beams technique. Excitation autoionization was shown to be of major importance in both ions for the region between 1 and 2 times threshold, leading to enhancement of the cross sections by factors of up to ∼2.5. Discrepancies between experiment and the well-known semi-empirical formula of Lotz were up to 70%, but reduction of Lotz's coefficient by a factor of 2 leads to satisfactory agreement at high energies. Comparison is also made with scaled-Born-approximation calculations.
Keywords
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