Rate coefficients for the reaction HS+NO+M→HSNO+M (M=He, Ar, and N2) over the temperature range 250–445 K

Abstract

HS radicals were generated by photodissociation of H2S at 193 nm and their disappearance monitored by LIF. The three-body recombination of HS with NO has been studied over the temperature range 250–445 K using He, Ar, and N2 as diluent gases. The temperature dependences of the low-pressure, three-body rate coefficients are given by 10−(22.56±0.60)T−(3.28±0.27), 10−(23.27±0.50)T−(2.98±0.20), and 10−(24.43±0.94)T−(2.48±0.36) cm6 molecule−2 s−1 for He, Ar, and N2, respectively. A tentative value of (2.7±0.5)×10−11 cm3 molecule−1 s−1 for the high pressure limiting rate coefficient over the range 250–300 K is suggested on the basis of extrapolation. These kinetic data are evaluated in terms of unimolecular rate theory.