A Gas-Phase Kinetic Study of the Reaction between Bromine Monoxide and Methylperoxy Radicals at Atmospheric Temperatures

The rate constant of the reaction of BrO with CH3O2 was determined to be k 1 = (6.2 ± 2.5) × 10-12 cm3 molecule-1 s-1 at 298 K and 100−200 Torr of O2 diluent. Quoted uncertainty was two standard deviations. No significant pressure dependence of the rate constants was observed at 100−200 Torr total pressure of N2 or O2 diluents. Temperature dependence of the rate constants was further investigated over the range 233−333 K, and an Arrhenius type expression was obtained for k 1 = 4.6 × 10-13 exp[(798 ± 76)/T] cm3 molecule-1 s-1. The product branching ratios were evaluated and the atmospheric implications were discussed.