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Issue 16, 1997
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Temperature dependence of the rate constant and branching ratio for the OH+ClO reaction

Abstract

The overall rate constant and branching ratio for the OH + ClO reaction have been measured using the turbulent flow technique with high-pressure chemical ionization mass spectrometry for the detection of reactants and products. At 298 K and ca. 100 Torr pressure, the overall rate constant was determined to be (1.46 ± 0.23) × 10 −11 cm 3 molecule −1 s −1 . The temperature dependence of the rate constant was investigated between 205 and 298 K, yielding the following Arrhenius expression: (5.5 ± 1.6)×10 −12 exp[(292 ± 72)/T] cm 3 molecule −1 s −1 . For the branching ratio studies OD was used instead of OH, making it possible to observe directly the production of DCl from the minor channel of the OD + ClO reaction. The temperature dependence of the rate constant for this minor channel was investigated between 210 and 298 K, yielding the following Arrhenius expression: (1.7 ± 0.3) × 10 −13 exp[(363 ± 50)/T] cm 3 molecule −1 s −1 . The branching ratio for the DCl channel was found to range from 0.05 ± 0.02 at 298 K to 0.06 ± 0.02 at 210 K.

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Article type: Paper
DOI: 10.1039/A701946G
Citation: J. Chem. Soc., Faraday Trans., 1997,93, 2665-2673
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    Temperature dependence of the rate constant and branching ratio for the OH+ClO reaction

    J. B. Lipson, M. J. Elrod, T. W. Beiderhase, L. T. Molina and M. J. Molina, J. Chem. Soc., Faraday Trans., 1997, 93, 2665
    DOI: 10.1039/A701946G

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