A laser flash photolysis-resonance fluorescence technique has been employed to investigate the production of Br, O, and BrO from photodissociation of bromine nitrate (BrONO 2 ) at wavelengths in the range 248-355 nm. The values obtained for the Br atom quantum yields are 0.35 ( 0.08, 0.65 ( 0.14, >0.62 ( 0.11, and 0.77 ( 0.19 at 248, 266, 308 and 355 nm, respectively. The values obtained for the O atom quantum yields are 0.66 ( 0.15, 0.18 ( 0.04, <0.13 ( 0.03, and <0.02 at 248, 266, 308, and 355 nm, respectively. Quantum yields for BrO production were investigated at some of the above wavelengths by converting photolytically generated BrO to Br via the reaction BrO + NO f Br + NO 2 . Measured BrO quantum yields are 0.37 ( 0.12 at 266 nm and 0.23 ( 0.08 at 355 nm. Uncertainties in the above quantum yields are estimates of absolute accuracy at the 95% confidence limit. No evidence for pressure-dependent quantum yields was observed over the range 20-200 Torr in N 2 bath gas. No evidence for temperature-dependent quantum yields was observed either, although only a few experiments were done at temperatures other than room temperature. The above results are considered in conjunction with recently reported NO 3 quantum yields [Harwood; et al. J. Phys. Chem. A 1998, 102, 1309 in order to examine the role of BrONO 2 photochemistry in the catalytic destruction of stratospheric ozone.