Kinetic study of the reaction OH + HI by laser photolysis-resonance fluorescence |
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| Authors: | H Mac Leod C Balestra J L Jourdain G Laverdet G Le Bras |
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| Institution: | Centre de Recherches sur la Chimie de la Combustion et des Hautes Températures CNRS, 45071 Orléans cedex 2, France |
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| Abstract: | The gas phase reaction of OH radicals with hydrogen iodide (HI) has been studied using a Laser Photolysis-Resonance Fluorescence (LP-RF) apparatus, recently developed in our group. The measured rate constant at 298 K was (2.7 ± 0.2) × 10?11 cm3 molecule?1 s?1. This rate constant is compared with the ones of the reactions OH + HCl and OH + HBr. The role of the reaction OH + HI in marine tropospheric chemistry is discussed. In addition, the LP-RF apparatus was tested and validated by measuring the following rate constants (in cm3 molecule?1 s?1 units): ??(OH + HNO3) = (1.31 ± 0.06) × 10?13 at p = 27 and 50 Torr of argon and ??(OH + C3H8) = (1.22 ± 0.08) × 10?12. These rate constants are in very good agreement with the literature data. |
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