Sb. Barone et al., REACTION OF OH WITH DIMETHYL SULFIDE (DMS) .1. EQUILIBRIUM-CONSTANT FOR OH-CENTER-DOT-DMS+O-2 REACTION(DMS REACTION AND THE KINETICS OF THEOH), Journal of physical chemistry, 100(35), 1996, pp. 14694-14702
The formation of a weakly bound adduct in the reaction of OH with DMS-
d(6) was observed between 217 and 240 K using the technique of pulsed
laser photolysis/pulsed laser-induced fluorescence. The equilibrium co
nstant for this process, OH + DMS-d(6) <----> OH . DMS-d(6), was measu
red as a function of temperature. The bond strength of this adduct was
determined to be 10.7 +/- 2.5 kcal mol(-1). The weakly bound adduct w
as observed to react rapidly with O-2. The rate constant for the react
ion OH . DMS-d(6) + O-2 --> products was determined to be (1.00 +/- 0.
33) x 10(-12) cm(3) molecules(-1) s(-1), independent of pressure and t
emperature. The atmospheric implications of the formation of this addu
ct and its reaction with O-2 to the mechanism of DMS oxidation in the
atmosphere are discussed.