1997
DOI: 10.1039/a701583f
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Kinetics of the HO2+BrO reaction over the temperature range 233–348 K

Abstract: The reaction is the rate-limiting step in a key catalytic ozone destruction cycle in the lower stratosphere. BrO ] HO 2 ] products In this study a discharge-Ñow reactor coupled with molecular beam mass spectrometry has been used to study the BrO ] HO 2 reaction over the temperature range 233È348 K. Rate constants were measured under pseudo-Ðrst-order conditions in separate experiments with Ðrst and then BrO in excess in an e †ort to identify possible complications in the reaction conditions. At HO 2 298 K, the… Show more

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Cited by 26 publications
(46 citation statements)
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“…It was not possible to obtain HO 2 concentrations reliably by the same method, due to the contaminating absorption arising from the significant concentrations of O 3 required to stoichiometrically convert Br atoms to BrO radicals. The initial concentration of HO 2 radicals generated via reactions (6), (7) and (8) was however constrained: An actinometric calibration of Cl 2 photolysis (and hence Cl atom generation and subsequent HO 2 production) was performed by monitoring the production of methylperoxy radicals in separate back-to-back experiments employing the photolysis of (known) concentrations of Cl 2 in the presence of O 2 and CH 4 .…”
Section: Approachmentioning
confidence: 99%
“…It was not possible to obtain HO 2 concentrations reliably by the same method, due to the contaminating absorption arising from the significant concentrations of O 3 required to stoichiometrically convert Br atoms to BrO radicals. The initial concentration of HO 2 radicals generated via reactions (6), (7) and (8) was however constrained: An actinometric calibration of Cl 2 photolysis (and hence Cl atom generation and subsequent HO 2 production) was performed by monitoring the production of methylperoxy radicals in separate back-to-back experiments employing the photolysis of (known) concentrations of Cl 2 in the presence of O 2 and CH 4 .…”
Section: Approachmentioning
confidence: 99%
“…1 This importance of halogen monoxide free radicals for the atmosphere has motivated numerous studies addressing ClO, BrO, and IO. [2][3][4][5][6] In most investigations ClO and BrO radicals are observed by absorption using their well-known A 2 ⌸ -X 2 ⌸ bands. In evaluating the gas-phase dynamics and mechanistics, however, detection methods which are more sensitive and state resolved in nature are required.…”
Section: ͓S0021-9606͑98͒02430-1͔mentioning
confidence: 99%
“…Note that the drawing only illustrates the relative position of the instrument, not the actual size or distance of the instrumental elements. The DF/MS system in present study has been described previously [Li et al, 1997;Li, 1999], and is only briefly discussed here. The reactor consisted of an 80-cmlong, 5.08-cm-ID Pyrex tube coated with halocarbon wax to reduce OH wall losses.…”
mentioning
confidence: 99%