A kinetic study of the reaction of fluorine atoms with CH₃F, CH₃Cl, CH₃Br, CF₂H₂, CO, CF₃H, CF₃CHCl₂, CF₃CH₂F, CHF₂CHF₂, CF₂ClCH₃, CHF₂CH₃, and CF₃CF₂H at 295 ± 2 K

Abstract

Abstract A variety of relative and absolute techniques have been used to measure the reactivity of fluorine atoms with a series of halogenated organic compounds and CO. The following rate constants were derived, in units of cm 3 molecule −1 s −1 : CH 3 F, (3.7 ± 0.8) × 10 −11 , CH 3 Cl, (3.3 ± 0.7) × 10 −11 ; CH 3 Br, (3.0 ± 0.7) × 10 −11 ; CF 2 H 2 , (4.3 ± 0.9) × 10 −12 ; CO, (5.5 ± 1.0) × 10 −13 (in 700 torr total pressure of N 2 diluent); CF 3 H, (1.4 ± 0.4) × 10 −13 ; CF 3 CCl 2 H (HCFC‐123), (1.2 ± 0.4) × 10 −12 ; CF 3 CFH 2 (HFC‐134a), (1.3 ± 0.3) × 10 −12 , CHF 2 CHF 2 (HFC‐134), (1.0 ± 0.3) × 10 −12 ; CF 2 ClCH 3 (HCFC‐42b), (3.9 ± 0.9) × 10 −12 , CF 2 HCH 3 (HFC‐152a), (1.7 ± 0.4) × 10 −11 ; and CF 3 CF 2 H (HFC‐125), (3.5 ± 0.8) × 10 −13 . Quoted errors are statistical uncertainties (2σ). For rate constants derived using relative rate techniques, an additional uncertainty has been added to account for potential systematic errors in the reference rate constants used. Experiments were performed at 295 ± 2 K . Results are discussed with respect to the previous literature data and to the interpretation of laboratory studies of the atmospheric chemistry of HCFCs and HFCs. © 1993 John Wiley & Sons, Inc.