Kinetic studies of the reaction of Cl atoms with CH3SSCH3
Abstract
The reaction of Cl atoms with dimethyl disulfide, CH3SSCH3, was studied in the gas phase and over the temperature range 273–363 K with the very low pressure reactor (VLPR) technique. The reaction proceeds via two competing pathways: (a) hydrogen atom abstraction that produces CH3SSCH2 radicals, with a rate given by the expression k1a=(1.83 ± 0.08)× 10–10 exp [–(2.43 ± 0.21)/RT] cm3 molecule–1 s–1, (R in kJ mol–1 K–1, 2σ uncertainty); and (b) an intermediate adduct CH3S(Cl)SCH3 formation channel, which further leads to CH3SCl and CH3S products, its rate is given by the expression k1b=(5.17 ± 0.32)× 10–11 exp [(3.39 ± 0.29)/RT] cm3 molecule–1 s–1. The branching ratio k1a/k1b was found to be 0.35 at room temperature and low pressure conditions.