Reactions of thermal energy ions. Part 5.—Ion-molecule reactions in hydrogen sulphide

Abstract

The formation of H₃S⁺ in the high-pressure mass spectrum of hydrogen sulphide has been shown to be due to the two concurrent ion-molecule reactions: [graphic omitted].

The cross-sections and rate constants for these reactions have been measured at a field strength of 10.5 V cm^–1(corresponding to an ion exit energy of 3.7 eV) when values of 2.1 × 10^–10 and 2.6 × 10^–10 molecule^–1 cm³ sec^–1 were obtained for k₁ and k₂ respectively. Using a pulsing technique the rate constants for thermal energy ions were measured and values of 2.8 × 10^–10 and 3.6 × 10^–10 obtained for k₁ and k₂. These have been compared with values calculated from the simple ion-induced dipole model.