DIRECT KINETIC AND MECHANISTIC STUDY OF THE OH plus DIMETHYLSULFIDE REACTION UNDER ATMOSPHERIC CONDITIONS.

A pulsed laser photolysis - pulsed laser induced fluorescence technique has been employed to carry out direct, real time studies of OH reactions with DMS and DMS-d//6 in N//2, air and O//2 buffer gases. Both temperature and pressure dependencies have been investigated. It is found that the observed rate constant depends on the O//2 concentration. Results are consistent with a mechanism which includes an abstraction route, a reversible addition route, and an adduct plus O//2 reaction which competes with adduct decomposition under atmospheric conditions.