Rate constants for the reaction of O(3P) atoms with CH2 = CHF,CH2 = CHCl,and CH2 = CHBr at 298 ± 2°K

Absolute rate constants for the reaction of O(³P) atoms with CH₂ = CHF, CH₂ = CHCl, and CH₂ = CHBr have been obtained at 298 ± 2°K using a modulation phase shift technique. The rate constants (k₂ × 10^?8 l./mole · sec) obtained are: CH₂ = CHF (1.61 ± 0.20), CH₂ = CHCl (2.54 ± 0.26), and CH₂ = CHBr (2.45 ± 0.25). These rate constants are lower than those determined by discharge flow techniques, but that for CH₂ = CHF is in good agreement with relative rate measurements.