Energetics of HeH+ Formed in H2+–He Collisions

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Abstract
Kinetic-energy distributions of forward-scattered HeH+ ions resulting from H2+–He collisions have been experimentally determined for H2+ laboratory kinetic energies in the range 1.7–12.5 eV. These distributions have two main peaks over most of this primary ion energy range. The lower-energy peak which appears to correspond to completely inelastic collisions is believed to result from enhanced collection efficiency, a conclusion which is supported by energetic considerations. The behavior of the higher-energy peak, which corresponds to ions formed in the forward direction (center of mass), is consistent with theoretical calculations for the HeH+ species.