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A drift tube-mass spectrometer apparatus has been used to determine the rate coefficient, energy dependence and product ions of the reaction He + + H 2 . The total rate coefficient at 300 K is (1.1 t 0.1) x 10-1 3 cm 3 /sec. The reaction proceeds principally (Z 80%) by dissociative charge transfer to produce H+, with the small r~mainder going by charge transfer to produce H2 + and by atom rearrangement to produce HeH+. The rate coefficient increases slowly with increasing ion mean energy,doi:10.1063/1.1682221 fatcat:wxzlhmamzbhq5oohfdhqv53iqq