Cavity ring-down study of BrO radicals: Kinetics of the Br + O3 reaction and rate of relaxation of vibrationally excited BrO by collisions with N2 and O2

✍ Scribed by Yuki Ninomiya; Satoshi Hashimoto; Masahiro Kawasaki; Timothy J. Wallington

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 256 KB
• Volume: 32
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/(sici)1097-4601(2000)32:3<125::aid-kin1>3.0.co;2-4

✦ Synopsis

Cavity ring-down (CRD) techniques were used to study the kinetics of the reaction of Br atoms with ozone in 1-205 Torr of either N 2 or O 2 , diluent at 298 K. By monitoring the rate of formation of BrO radicals, a value of k(Br ϩ O 3 ) ϭ (1.2 Ϯ 0.1) ϫ 10 Ϫ12 cm 3 molecule Ϫ1 s Ϫ1 was established that was independent of the nature and pressure of diluent gas. The rate of relaxation of vibrationally excited BrO radicals by collisions with N 2 and O 2 was measured;

. The increased efficiency of O 2 compared with N 2 as a relaxing agent for vibrationally excited BrO radicals is ascribed to the formation of a transient BrO-O 2 complex.