Dissociative charge transfer of He+ ions with H2 and D2 molecules from 78 to 330 K

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Abstract
The dissociative charge transfer of He+ ions with H2 and D2 molecules has been studied using a temperature‐variable drift‐tube mass‐spectrometer apparatus over the temperature range 78 to 330 K. The binary rate coefficients are small at 300 K, ∼10−13–10−14 cm3/sec, and only slightly larger at 78 K. Termolecular contributions to the binary rate coefficients are found to be small at 330 K but increase substantially with decreasing temperature. Two‐body charge transfer with D2 is found to be slower than with H2 by a factor of 10, in good agreement with recent theoretical predictions, although the measured values of the rate coefficients are larger by a factor of ∼4 than the predicted values.