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KMID : 1156220090350060532
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Journal of Environmental Health Sciences
2009 Volume.35 No. 6 p.532 ~ p.537
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CRDS Study of Tropospheric Ozone Production Kinetics : Isoprene Oxidation by Hydroxyl Radical
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Park Ji-Ho
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Abstract
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The tropospheric ozone production mechanism for the gas phase additive oxidation reaction of hydroxyl radical (OH) with isoprene (2-methyl-1,3-butadiene) has been studied using cavity ring-down spectroscopy (CRDS) at total pressure of 50 Torr and 298 K. The applicability of CRDS was confirmed by monitoring the shorter (~4%) ringdown time in the presence of hydroxyl radical than the ring-down time without the photolysis of hydrogen peroxide. The reaction rate constant, (9.8±0.1)×10?11 molecule?1cm3s?1, for the addition of OH to isoprene is in good agreement with previous studies. In the presence of O2 and NO, hydroxyl radical cycling has been monitored and the simulation using the recommended elementary reaction rate constants as the basis to OH cycling curve gives reasonable fit to the data.
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KEYWORD
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cavity ring-down spectroscopy, ozone, isoprene, oxidation, rate constant
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