Atomic resonance fluorescence for rate constants of rapid bimolecular reactions. Part 7.—Sulphur atom reactions: S + O2→ SO + O and S + NO2→ SO + NO from 296 to 410 K

Abstract

Detection of S ³P_J atoms in a flow system, using atomic resonance fluorescence at 181 nm, has been used to determine the rate constants k₁ and k₂/cm³ s^–1 for reactions (1) and (2): S + O₂[graphic omitted]SO + O, S + NO₂[graphic omitted]SO + NO., Pseudo first-order conditions were used wih [O₂]₀/[S]₀ and [NO₂]₀/[S]₀ 1. Measurements of k₁ and k₂ from 296 to 410 K gave the following Arrhenius expressions: k₁=(1.7 ± 0.5)× 10^–12 exp (+(153 ± 108)/T) cm³ s^–1; (2σ) and k₂=(4.9 ± 1.0)× 10^–11 exp (+(84 ± 60)/T) cm³ s^–1. (2σ)