Study of elementary reactions by atomic resonance absorption with a non-reversed source. Part 1.—The reaction Cl + O3→ ClO + O2

Abstract
The rate constant k1 for the reaction Cl 2P+ O3→ ClO + O2(1) has been measured over the temperature range 221–629 K. Atomic resonance absorption with a metastable Ar lamp, which emits non-reversed thermal Cl atom lines, was used to follow the pseudo first order decay of [Cl] in excess of O3. The Arrhenius expression is given as log10(k1/cm3 molecule–1 s–1)=–(10.286 ± 0.039)–[(181 ± 12)/T]. Comparisons with other recent measurements are made.