The atmospherically important reactions of both CH3S and CH3SOO were e
xamined using the technique of pulsed laser photolysis/laser-induced f
luorescence. Rate coefficients for the reactions CH3S + 03 --> product
s (1) and CH3S + NO2 --> CH3SO + NO (2) were measured to be k1(T) = (1
.98 +/- 0.38) X 10(-12) exp[(290 +/-40)/T] cm3 molecule-1 s-1 and k2(T
) = (2.06 +/- 0.44) x 10(-11) exp[(320 +/- 40)/T] cm3 MolecUle-1 s-1.
The reactions of the weakly bound CH3SOO adduct with O3, NO2, and NO w
ere studied at low temperatures. The rate coefficients for the adduct
reactions are as follows: CH3SOO + 03 --> products (4), k4 < 8 X 10(-1
3) CM3 molecule-1 s-1 at T = 227 K; CH3SOO + NO2 --> products (5), k5
= (2.2 +/- 0.6) X 10(-11) CM3 molecule-1 s-1 at T = 227-246 K; and CH3
SOO + NO --> products (6), k6 = (1.1 +/- 0.4) x 10(-11) CM3 Molecule-1
s-1 from T = 227-256 K. The measured values of k5 and k6 were indepen
dent of temperature and pressure over the limited ranges employed. The
atmospheric implications of these findings are discussed.