EPR KINETIC STUDY OF REACTIONS OF CF3BR WITH H-ATOMS AND OH-RADICALS

Reactions of CF3Br with H atoms and OH radicals have been studied at room temperature at 1–2 torr pressures in a discharge flow reactor coupled to an EPR spectrometer. The rate constant of the reaction H + CF3Br → CF3 + HBr (1) was found to be k1 = (3.27 ± 0.34) × 10−14 cm3/molec·sec. For the reaction of OH with CF3Br (8) an upper limit of 1 × 10−15 cm3/molec·sec was determined for k8. When H atoms were in excess compared to NO2, used to produce OH radicals, a noticeable reactivity of OH was observed as a result of the reaction OH + HBr → H2O + Br, HBr being produced from reaction (1). Copyright © 1978 John Wiley & Sons, Inc.