Rate constants for the thermal energy reactions of He+, He(21S), and He(23S) with HCl and HBr

Abstract
The rate constants for the reactions of He+, He(21S), and He(23S) with HCl and HBr are reported. The charge‐transfer reactions are dissociative and the rate constants lie between the Langevin and locked dipole rates. The Penning ionization rate constants are also large. The ratio of singlet‐to‐triplet cross sections is 2.3.