Multiple ionization of noble gases by swift H{sub 2}{sup +} ions in breakup and nonbreakup collisions
Journal Article
·
· Physical Review. A
- Departamento de Fisica, Pontificia Universidade Catolica do Rio de Janeiro, Caixa Postal 38071, Rio de Janeiro, RJ 22452-970 (Brazil)
- Instituto de Fisica, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro, RJ 21941-972 (Brazil)
- Department of Pure and Applied Physics, The Queen's University of Belfast, Belfast BT7 1NN (United Kingdom)
- Instituto de Radioprotecao e Dosimetria, Comissao Nacional de Energia Nuclear, Rio de Janeiro, RJ 22780-160 (Brazil)
We have measured multiple-ionization yields of He, Ne, Ar, Kr, and Xe targets by 1.0 MeV/amu H{sub 2}{sup +} molecular ions for both the dissociative and nondissociative channels. Except for the case of the breakup of the H{sub 2}{sup +} into two protons, we have also determined the absolute cross sections for the multiple ionization of the targets. The ratios of multiple to single ionization for the nondissociative channel are similar to those for equivelocity protons, which, however, are consistently smaller than those for the breakup channels, for all charge states and targets. A simple analysis, based on the independent particle model, considering postcollisional time-delayed ionization for the Ne and Ar targets, evinces the importance of these mechanisms in the target multiple ionization and of the antiscreening in collisions where the projectile electron undergoes a transition.
- OSTI ID:
- 20643772
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 69; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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