Fourier transform infrared spectroscopy was used to identify CH₂FOOH and HC(O)F as products of the gas-phase reaction of CH₂FO₂ radicals with HO₂ radicals. At 700 Torr and 295 ± 2 K, branching ratios for the CH₂FOOH forming channel, k_1a/k₁=0.29 ± 0.08 and the HC(O)F channel, k_1b/k₁=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 CH₂FCl and CH₂FOOH was investigated; rate constants of k(Cl + CH₂FCl) = (1.1 ± 0.1) × 10^-13 and k(Cl + CH₂FOOH) = (1.5 ± 0.5) × 10^-13 cm³ molecule^-1 s^-1 were determined.