Drift tube investigation of the reactions H++D2→HD+D+ and D++H2→HD+H+ in the relative energy range 0.04–0.3 eV

The reactions of H+ with D2 and of D+ with H2 have been studied in a helium‐buffered drift experiment in the regime from near thermal up to 0.3 eV relative kinetic energies KEcm of the reactants. The rate coefficient of the first, endoergic reaction, increase with KEcm, up to 8.5×10−10 cm3 sec−1 at 0.3 eV, and extrapolates smoothly at near thermal energies into values obtained recently in a SIFT experiment (Ref. 3). The second reaction shows a rate coefficient k = 1.1×10−9 cm3 sec−1, independent of energy within the regime studied here.