Rate constants for the reaction of the OH radical with H2 and NO (M=Ar and N2)

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Abstract
Absolute rate constants for the reaction of OH radicals with H2 and NO (M=Ar, N2) have been determined at 298±1 °K using a flash photolysis–resonance fluorescence technique. The rate constant for the reaction OH+H2 was determined to be (6.97±0.70) ×10−15 cm3 molecule−1 sec−1 in good agreement with recent literature values. Rate constants for the reaction OH + NO + M (M = Ar) were obtained over the pressure region 25–655 torr, while a rate constant for M = N2 was obtained at 25 torr total pressure. The low pressure third order rate constants for this reaction were determined to be (4.25±0.43) ×10−31 cm6 molecule−2 sec−1 (M=Ar) and (6.1±0.7) ×10−31 cm6 molecule−2 sec−1 (M = N2), in good agreement with the available literature values. The bimolecular rate constants at 760 torr total pressure were determined to be (5.2±0.8) ×10−12 cm3 molecule−1 sec−1 for M = Ar and (6.1±1.0) ×10−12 cm3 molecule−1 sec−1 for M = N2. A value of 8×10−12 cm3 molecule−1 sec−1 was obtained as a probable lower limit for the limiting high pressure second order rate constant from an extrapolation of the data.