Ionization and charge transfer inHe2+–rare-gas collisions

Cross sections for all significant channels leading to positive-ion and free-electron production in ${\mathrm{He}}^{2+}$–rare-gas collisions are presented. The energy range studied is 15–200 keV. It is shown that the electron production is dominated by the single charge transfer plus ionization channels—even for a helium target. It is also shown that charge transfer plus an additional ionization can be more probable than charge transfer by itself. For double capture from argon and krypton, this is observed to occur throughout the entire energy range studied.