Atmospheric chemistry of CF 3CFHOCF 3: kinetics of the reaction with Cl atoms and fate of CF 3CFO( [rad])OCF 3 radicals

Abstract

The kinetics and products of the Cl atom initiated oxidation of CF 3CFHOCF 3 in 50–700 Torr of air, or N 2, diluent at 295±2 K were studied using smog chamber/FTIR techniques. Relative rate methods were used to measure k( Cl+ CF 3 CFHOCF 3)=(6.0±0.8)×10 −17 cm 3 molecule −1 s −1 . The reaction of Cl atoms with CF 3CFHOCF 3 proceeds substantially (approximately a factor of 500) times slower than reported recently by Li et al. [Chem. Phys. Lett. 320 (2000) 70]. The atmospheric degradation of CF 3CFHOCF 3 gives the alkoxy radical CF 3CFO( )OCF 3. The atmospheric fate of CF 3CFO( )OCF 3 radicals is decomposition via C–C bond scission to give FC(O)OCF 3 and CF 3 radicals. The atmospheric degradation mechanism of CF 3CFHOCF 3 is discussed.