The production and subsequent relaxation of vibrationally excited OH in the reaction of atomic oxygen with HBr

Abstract

Abstract A fast discharge flow apparatus equipped for EPR detection of radicals has been used to investigate the reaction O + HBr → OH + Br. At 295°K, measurements showed that more than 97% of all OH produced in this reaction was formed initially in its first vibrationally excited state. Rate constants for physical deactivation of OH( v = 1) by O( 3 P ), Br( 2 P 3/2 ), H 2 O, and HBr were measured as (1.45 ± 0.25) × 10 −10 , (6.4 ± 2.4) × 10 −11 , (1.35 ± 0.50) × 10 −11 , and < 10 −12 cm 3 /molec·sec, respectively.