Effect of electron scavengers on the gamma radiolysis of H2S-Ch3Br systems

The mechanism of mixed dimer negative ion formation in the gamma radiolysis of the gaseous system hydrogen sulphide-methyl bromide has been investigated using carbon tetrachloride and chloroform as the electron scavengers. The concentration of methane was measured gas-chromatographically. The measurements were performed at different total pressures. ΔG(CH4)-1 is a linear function of [CH 3 Br][H2S]2/[Sc] (where Sc═CCl4 or CHCl3). On the basis of the above dependencies the mechanism of the formation of the (CH 3 Br-H 3 S)− ion was confirmed and the rate constant was calculated to be k=K-ka-kc/ka = 6.5 ×l0 −49 cm 9 molecule −3 s −1