Multiple-electron ionization, capture, and loss by 19-MeV F{sup {ital q}+} ({ital q}=2--9) in collisions with Ne and Ar
- Cyclotron Institute and Department of Chemistry, Texas A&M University, College Station, Texas 77843 (United States)
- J. R. MacDonald Laboratory, Kansas State University, Manhattan, Kansas 66506 (United States)
Charge-exchange processes in fast collisions of F{sup {ital q}+} ({ital q}=2--9) on Ne and Ar gas targets have been studied using the projectile--recoil-ion coincidence method. The target ionization without a projectile charge change increases with increasing projectile charge approximately as {similar_to}{ital q}{sup 1.4}. This dependence is weaker than the {ital q}{sup 2} dependence predicted by the first Born approximation because of the large ionization probabilities involved. The single-electron-capture cross sections follow the known {ital q}{sup 3} scaling law, while the double-electron-capture cross sections display a {ital q}{sup 6} dependence, as predicted by the independent-electron approximation for small capture probabilities. Single- and double-electron loss from the {ital L} shell decreases with increasing {ital q} mainly because of the decrease in the number of {ital L}-shell electrons, while binding-energy effects play only a minor role. In contrast, the large sudden decrease in electron-loss cross sections once {ital K}-shell electrons must be removed is due to the large increase in binding energy.
- OSTI ID:
- 147823
- Journal Information:
- Physical Review A, Vol. 52, Issue 6; Other Information: PBD: Dec 1995
- Country of Publication:
- United States
- Language:
- English
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