The kinetics of the reaction between O2(1∆g) and ozone

Abstract

Abstract The kinetics of the reaction O2(1∆g) + O3k2→ 2O2 + O have been investigated in the temperature range 195 to 439 K by using the kinetic photo­ionization technique to follow [O2(1∆g)]. In Arrhenius form, the rate constant, k2,'is given by k2 = 4.0 ± 1.5 x 108 exp (13000 /RT) 1 mol-1 s-1 (joule units) ( = 4.0 ± 1.5 x 108 exp (3100/RT) 1 mol-1 s-1 (calorie units)). At room temperature (292 K) k2 = 2.1 ± 0.3 x 106 1 mol-1 s-1. The activation energy of 13 ± 1.6 kJ mol-1 suggests that there is virtually no barrier to the reaction other than that provided by its endothermicity (12.1 kJ mol-1). The results are used to derive, from pre­viously published data, a value of the rate constant for the reaction O + O3k3→ 2O2 of 4 ± 2 x 106 1 mol-1 s-1 at room temperature.