A pulse radiolysis technique has been used to measure the UV spectra of FCO and FC(O)O₂ radicals over the ranges 265-275 and 220-290 nm, respectively. At 269.6 nm, σ_FCO = (1.7 ± 0.2) × 10^-18 cm² molecule^-1; at 250 nm, σ_FC(O)O2 = (2.1 ± 0.2) × 10^-18 cm² molecule^-1. The decay of UV absorption was used to study the kinetics of the self-reactions of FCO and FC(O)O₂ radicals at 296 ± 2 K. Observed self-reaction rate constants, defined as -d[FCO]/dt = 2k₇[FCO]² and -d[FC(O)O₂]/dt = 2k_8obs[FC(O)O₂]², were k₇ = (1.6 ± 0.2) × 10^-11 and k_8obs = (6.0 ± 0.7) × 10^-12 cm³ molecule^-1 s^-1. A rate constant, k₁ = (1.2 ± 0.2) × 10^-12 cm³ molecule^-1 s^-1, was derived for the addition reaction FCO + O₂ → FC(O)O₂ in 1000 mbar of SF₆ diluent. Rate constants for the reactions of FCO, FC(O)O, and FC(O)O₂ radicals with NO were determined to be (1.0 ± 0.2) × 10^-12, (1.3 ± 0.7) × 10^-10, and (2.5 ± 0.8) × 10^-11, cm³ molecule^-1 s^-1, respectively. An upper limit of k₃ < 6 × 10^-14 cm³ molecule^-1 s^-1 was measured for the reaction of FC(O)O radicals with O₃. Finally, a rate constant of (5.5 ± 0.7) × 10^-12 cm³ molecule^-1 s^-1 was measured for the association reaction of F atoms to NO in 1000 mbar of SF₆ diluent. All experiments were performed at 296 ± 2 K. Results are discussed with respect to the atmospheric chemistry of hydrofluorocarbons.