Open AccessKinetic studies of the reactions of BrO and IO radicals
Author(s) -
Laszlo Barna,
Huie Robert E.,
Kurylo Michael J.,
Miziolek Andrzej W.
Publication year - 1997
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/96jd00458
Subject(s) - bromine , reaction rate constant , radical , kinetic energy , chemistry , photodissociation , analytical chemistry (journal) , absorption (acoustics) , molecule , photochemistry , kinetics , materials science , organic chemistry , physics , composite material , quantum mechanics
The 193‐nm laser photolysis Of Br 2 /N 2 O mixtures in N 2 buffer has been utilized to determine the absorption cross section of BrO and to study the reactions of O( 3 P ) with Br 2 , O( 3 P ) with BrO, and the self reaction of BrO at room temperature. The measured kinetic data are in good agreement with the literature values. Molecular bromine formation in the self‐reaction of BrO can be described by the concerted steps of Br+BrO→BrOBr and Br+BrOBr→Br 2 +BrO. From a curve fitting of the simultaneously monitored BrO and IO decays in the Br 2 /I 2 /N 2 O system, room temperature rate constants for the BrO+IO→Products and I+BrO→IO+Br reactions of (6.9±2.7)×10 −11 cm 3 /molecule/s and (1.2±0.6)×10 −11 cm 3 molecule/s, respectively, were derived. Similar experiments using IBr, instead of Br 2 /I 2 , revealed a marked sensitivity of the rate constant analysis to the accessible ratio of radical concentrations. Kinetic analysis of this complex reaction system is presented.