Temperature Dependence of the Rate Coefficient of the Reaction OH + CF 3 CH 2 F over the Range 255‐424 K

The rate coefficient of the reaction of OH with CF 3 CH 2 F at six temperatures in the range 255‐424 K was determined by means of the discharge‐flow/resonance‐fluorescence technique. The resonance fluorescence of OH, excited by emission from a gaseous mixture of H 2 O and He subjected to a microwave discharge, was detected by photon‐counting technique. The reaction was carried out under pseudo‐first‐order conditions with [CF 3 CH 2 F] >> [OH]; the rate coefficient was determined to be k = (3.9±0.6) × 10 −15 cm 3 molecule −1 s −1 at 298 K; the uncertainty represents the 95% confidence limit. The temperature dependence of the rate coefficient is expressed in the Arrhenius form, k(T) = (9.9±1.0) × 10 −13 exp [‐(1640±150)/T] cm 3 molecule −1 s 1 .