Pulsed and steady-state photolysis techniques have been employed to measure the rate coefficients for collisional deactivation of the spin-orbit excited state of atomic bromine, Br(4 P-2(1/2)). Pulsed lifetime studies for quenching by Br-2 and CO2 yielded absolute rate coefficients at room temperature of k(Br2) = 1.2+/-0.1 x 10(-12) and k(CO2) = 1.5+/-0.3x10(-11) cm(3)/molecules. The rate coefficients for quenching by rare gases, N-2 O-2, NO, NO2, N2O, CO, CO2, COS, SO2, SF6, CF4, CH4, H2S, H-2, D-2, HBr, HCl, and HI, relative to that for Br-2 were determined in a steady-state photolysis experiment. Correlation of the deactivation probabilities with energy defect for the case of electronic-to-vibrational energy transfer is demonstrated.