Kinetics of the reaction of SH and SD with NO2

Article abstract of DOI:10.1021/jp053918r

The rate constants for the reactions of NO₂ with SH and SD were measured between 250 and 360 K to be 2.8 × 10^-11 exp{(270 ± 40)/T(K)} and 2.6 × 10^-11 exp{(285 ± 20)/T(K)} cm³ molecule^-1 s^-1, respectively. SH(SD) radicals were generated by pulsed laser photolysis of H₂S(D ₂S) or CH₃SH and detected via pulsed laser-induced fluorescence. The laser-induced fluorescence excitation spectrum of SH was found to be contaminated by the presence of the SO radical. This contamination is suggested as a possible reason for differences among some of the reported values of k₁ in the literature. The title reaction influences the atmospheric lifetime of the SH radical when NO₂ is greater than 100 pptv, but the revised value of k₁ does not significantly alter our current understanding of SH oxidation in the atmosphere.