Journal of the American Chemical Society p. 6937 - 6941 (1980)
Update date:2022-08-12
Topics:
Howard, Carleton J.
Rate constants for the reactions HO2 + NO -> NO2 (kF) and OH + NO2 -> HO2 + NO (kR) have been measured at high temperatures by using laser magnetic resonance ddtection of HO2 and OH reactants in a flow tube reactor.The results are kF(T) = (3.51 +/- 0.35) * 10-12 exp<(+240 +/- 30)/T> cm3 molecule-1 s-1 for 232 < T < 1271 K, including earlier low-temperature measurements and kR(T) = (3.03 +/- 0.60) * 10-11 exp<-(3360 +/- 125)/T> cm3 molecule-1 s-1 for 452 < T < 1115 K.These data are combined with other thermochemical data to calculate the heat of formation of the HO2 radical, <*> = 2.5 +/- 0.6 kcal mol-1.Other measurements of this quantity and the thermochemistry of HO2 are discussed.
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