Temperature dependence of the rate constant and product channels for the BrO + ClO reaction

Journal Article · Thu Apr 07 04:00:00 EDT 1988 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100318a032· OSTI ID:6613589

Hills, A J; Cicerone, R J; Calvert, J G; Birks, J W

The authors have measured the rate constant for the reactions BrO + ClO ..-->.. Br + OClO (6a), BrO + ClO ..-->.. Br + Cl + O/sub 2/ (6b), and BrO + ClO ..-->.. BrCl + O/sub 2/ (6c) over the temperature range 241-408 K and found k/sub 6/ = (8.2 +/- 1.0) x 10/sup -12/ cm/sup 3/ molecule/sup -1/ s/sup -1/ independent of temperature. Measurement of the individual product branching ratios yielded values for channels 6a, 6b, and 6c equal to 0.55 +/- 0.10, 0.45 +/- 0.10, and < 0.02, respectively. Measurements of ozone in the stratosphere over Antarctica have shown that the springtime ozone column has fallen 40% from 1960 to 1985. The reaction above could account for a large fraction of the springtime ozone hole reported recently, provided that at least 20 ppt of total inorganic bromine is present, and it may provide a source of chlorine dioxide of sufficient magnitude to explain the recent measurements of this species in the Antarctica stratosphere.

• Research Organization: Univ. of Colorado, Boulder (USA)
• OSTI ID: 6613589
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:7; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
500100 -- Environment
Atmospheric-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
BROMINE COMPOUNDS
BROMINE OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
CHLORINE OXIDES
DATA
DECOMPOSITION
EARTH ATMOSPHERE
EXPERIMENTAL DATA
HALOGEN COMPOUNDS
INFORMATION
KINETICS
MEDIUM TEMPERATURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
REACTION KINETICS
STRATOSPHERE
TEMPERATURE DEPENDENCE
TROPOSPHERE