Single and double ionisation of helium by H+, He2+and Li3+ions
- 14 March 1985
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 18 (5) , 899-913
- https://doi.org/10.1088/0022-3700/18/5/010
Abstract
A crossed-beam technique incorporating time-of-flight spectroscopy together with electron-ion and ion-ion coincidence counting of the collision products has been used to study the ionisation of He by H+, He2+ and Li3+ ions. Cross sections for single and double ionisation have been determined with high precision at energies within the range 50-2380 keV amu-1. Cross sections for single ionisation have been compared with the predictions of the first Born approximation, while cross sections for double ionisation have been considered in terms of the 'two-step' and 'shake-off' mechanisms. The authors have also measured the corresponding cross sections for one- and two-electron capture and for the transfer-double-ionisation process; the latter is shown to be the main He2+ production mechanism at the lower impact energies.Keywords
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