Kinetics of the reaction of SF6− with O3

Abstract

The reaction of SF₆⁻ with O₃ (1) has been studied at room temperature using a recently constructed flowing-afterglow apparatus. The measured rate constant is k₁ = (1.7 ± 0.5) × 10⁻¹⁰ cm³ molecule⁻¹ s⁻¹, i.e. below the value calculated by the average dipole orientation theory and in disagreement with previous experimental data. Possible systematic errors have been rejected on the basis of kinetic results obtained in the same apparatus for the reactions of SF₆⁻ with NO₂ (2) and Cl₂ (3), and for the reactions of O₃ with O₂⁻ (4) and CO₄⁻ (5). The rate constants measured for these reactions are in agreement with previous determinations: k₂ = (1.5 ± 0.7), k₃ = (1.1 ± 0.3), k₄ = (6.3 ± 2.0) and k₅ = (3.4 ± 1.0), in units of 10⁻¹⁰ cm³ molecule⁻¹ s⁻¹.