A semiclassical model for He is applied to the study of multiply charged ions colliding with He at intermediate energies. Single and double-electron capture and ionisation and capture-ionisation reactions are studied for incident-ion charge states q=+1 to +50 at 1 MeV amu-1. For charge states q>or approximately=+10, single electron capture is found to be dominated by a two-electron transition in which one electron is captured and the other is ionised.
R. E. Olson et al., "Double Electron Transitions In Collisions Between Multiply Charged Ions And Helium Atoms," Journal of Physics B: Atomic and Molecular Physics, vol. 19, no. 18, article no. 007, IOP Publishing, Dec 1986.
The definitive version is available at https://doi.org/10.1088/0022-3700/19/18/007
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01 Dec 1986