Dissociative charge transfer of He+ions with H2and D2molecules from 78 to 330 K

摘要

The dissociative charge transfer of He+ions with H2and D2molecules has been studied using a temperaturehyphen;variable drifthyphen;tube masshyphen;spectrometer apparatus over the temperature range 78 to 330 K. The binary rate coefficients are small at 300 K, sim;10minus;13ndash;10minus;14cm3/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. Twohyphen;body charge transfer with D2is found to be slower than with H2by 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 sim;4 than the predicted values.