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A flash photolysis‐resonance fluorescence study of the reaction of atomic hydrogen with molecular oxygen H + O 2 + M → HO 2 + M
Author(s) -
Wong W.,
Davis D. D.
Publication year - 1974
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550060310
Subject(s) - chemistry , flash photolysis , resonance fluorescence , arrhenius equation , reaction rate constant , photodissociation , oxygen , analytical chemistry (journal) , hydrogen , atmospheric temperature range , resonance (particle physics) , fluorescence , photochemistry , activation energy , kinetics , atomic physics , thermodynamics , physics , organic chemistry , quantum mechanics , chromatography
Using the technique of flash photolysis‐resonance fluorescence, absolute rate constants have been measured for the reaction H + O 2 + M → HO 2 +M over a temperature range of 220–360°K. Over this temperature range, the data could be fit to an Arrhenius expression of the following form:\documentclass{article}\pagestyle{empty}\begin{document}$$k_{{\rm Ar}} = (6.75{\rm } \pm {\rm }1.1){\rm } \times {\rm }10^{ - 33} \exp {\rm }[685{\rm } \pm {\rm }128{\rm cal/mole]/}RT$$\end{document} The units for k Ar are cm 6 /mole‐s. At 300°K the relative efficiencies for the third‐body gases Ar:He:H 2 :N 2 :CH 4 were found to be 1.0:0.93:3.0:2.8:22. Wide variations in the photoflash intensity at several temperatures demonstrated that the reported rate constants were measured in the absence of other complex chemical processes.