A pulse radiolysis technique was used to investigate the kinetics and products of the reaction of CF 2 BrH with fluorine atoms at 296 K. This reaction forms an adduct which is in dynamic equilibrium with CF 2 BrH and fluorine atoms. The UV absorption spectrum of the adduct was measured relative to the UV spectrum of the CH 3 O 2 radical over the range 230-380 nm. At 280 nm, an absorption cross section of (1.4 ± 0.1) 10 - 1 7 cm 2 molecule - 1 was determined. From the absorption at 280 nm the equilibrium constant K 5 = [adduct]/([F] [CF 2 BrH]) was measured to be (1.59 ± 0.13) 10 - 1 7 cm 3 molecule - 1 . In 1 atmosphere of SF 6 , the forward rate constant k 5 = (1.5 ± 0.5) 10 - 1 1 cm 3 molecule - 1 s - 1 and the backward rate constant k 5 = (8.8 ± 3.0) 10 5 s - 1 were determined by monitoring the rate of formation and loss of the adduct. As part of the present work, a relative rate technique was used to measure k(Cl + CF 2 BrH) = (5.8 ± 1.0) 10 - 1 5 cm 3 molecule - 1 s - 1 at 296 K and 700 Torr of N 2 . The fate of the oxy radical, CF 2 BrO, in the atmosphere is bromine atom elimination and formation of COF 2 .