Reactions between H+ and D2

Cross sections have been measured for the production of D2+, HD+, and D+ in reactions between H+ and D2. The initial kinetic energies Ec.m. in the center-of-mass system are between 0.3 and 80 eV. The total cross section σT for these reactions can be represented by σT = 1.54 Ec.m.−0.7 for 8 ≤ Ec.m. ≤ 80 eV, and σT = 2.11 Ec.m.−1.43 for 0.3 ≤ Ec.m. ≤ 2 eV, where σT is in square angstroms, and Ec.m. is in electron volts. Apparent thresholds for the endothermic reactions H++D2→D2++H, H++D2→HD++D are found at Ec.m. = 1.84 ± 0.3 eV. The cross section for H++D2→D++HD drops rapidly with increasing energy. For Ec.m. ≳ 6 eV, D+ appears to be produced mostly by the reaction H++D2→D++D+H. When Ec.m. ≳ 8 eV, the reaction products are primarily D2+ and a smaller amount of D+. There is only fair agreement between these results and those of previous studies.