Abstract
Cross sections for the nondissociative single ionization and double ionization of ${\mathrm{H}}_{2}$ by ${\mathrm{He}}^{2+}$ projectiles in the range of 125--750 keV/amu are reported. The results are compared to impact-parameter calculations and to measurements with ${\mathrm{He}}^{+}$ projectiles. The direct double-collision process is found to be the important contributor to double ionization in this range of energies. The single-ionization cross section, when compared to proton bombardment, does not scale as ${\mathit{Z}}^{2}$.
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