γ-radiolysis of gaseous hydrogen sulphide in the presence of hydrogen chloride, carbon disulphide and nitrous oxide

Addition of HCl to H2S increases the radiation yield of H2G(H2) 7.0→10.0 by an electron scavenging process involving HCl and H2S. CS2 lowers the H2 yield in pure H2S probably by reaction with hot H atoms and also scavenges the electrons in H2S + HCl mixtures, lowering G(H2) in the process to <7.0. Electron scavenging by addition of N2O to H2S to produce N2 is shown to be a very complex system with surface reactions probably playing a part.