The rate coefficient for radiative charge transfer from H atoms to He 2+ ions is calculated at temperatures in the range 250°K to 64000°K. It is found to be almost independent of temperature and to be very high (the mean value being about 1.6 × 10 -13 cm 3 sec -1 ). As a subsidiary part of the work, earlier computations on the exact two centre wave functions of the 1sσ and 2pσ states of HeH 2+ and on the transition integral connecting these states are extended to internuclear separations up to 10 atomic units.
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Arthurs et al. (1957) studied this question.
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