Abstract
Fourier transform infrared spectroscopy was used to identify CH 2FOOH and HC(O)F as products of the gas-phase reaction of CH 2FO 2 radicals with HO 2 radicals. At 700 Torr and 295 ± 2 K, branching ratios for the CH 2FOOH forming channel, k 1a/ k 1=0.29 ± 0.08 and the HC(O)F channel, k 1b/ k 1=0.71 ± 0.11 were established. Quoted errors are 2 standard deviations together with our estimate of systematic uncertainties. This result is discussed with respect to previous literature data and to computer models of atmospheric chemistry. As part of this work, the reactivity of Cl atoms towards CH 2FCl and CH 2FOOH was investigated; rate constants of k(Cl + CH 2FCl) = (1.1 ± 0.1) × 10 −13 and k(Cl + CH 2FOOH) = (1.5 ± 0.5) × 10 −13 cm 3 molecule −1 s −1 were determined.
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