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| - Low-Temperature Kinetics of Reactions of the OH Radical with Propene and 1-ButeneStudied by a Pulsed Laval Nozzle Apparatus Combined with Laser-Induced Fluorescence
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| - The kinetics of the reactions of the OH radical with propene and 1-butene are studied at T = 103 K. Thelow-temperature environment is provided by a pulsed Laval nozzle supersonic expansion of nitrogen withadmixed radical precursor and reactant gases. The gas number density and temperature distributions in theflow are characterized by both dynamic pressure measurements and laser-induced fluorescence (LIF)spectroscopy of OH radicals excited in the (1,0) band of the A2Σ+−X2Πi transition. For the kineticmeasurements, the OH radical decay profiles in the presence of reactants are monitored by LIF. The rateconstants of the reactions of OH with propylene and 1-butene are measured at T = 103 K to be (0.81 ± 0.18)× 10-10 and (1.24 ± 0.27) × 10-10 cm3 molecule-1 s-1, respectively. The observed negative temperaturedependences of the rate constants for both reactions studied by the pulsed Laval nozzle system show goodagreement with both low-temperature and high-temperature kinetic data available in the literature.
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