Reaction rate constant for OH + HOONO/sub 2/. -->. products over the temperature range 246 to 324 K
Absolute bimolecular reaction rate constants for the title reaction have been determined for temperatures ranging from 246 to 324 K. The laser flash-photolysis resonance-fluorescence (LFPRF) technique was used to generate O(/sup 1/D) which reacted with H/sub 2/ and/or H/sub 2/O to produce OH radicals. The bimolecular rate constants for the title reaction showed no dependence on total (He) pressure over the range approx. 3 to 15 torr, and they did not depend upon initial (OH) or upon its mode of formation. The H/sub 2/O/sub 2/ impurity was explicitly measured in all experiments, and the rate constants were corrected for its contribution. A weighted least-squares analysis of the data obtained at nine temperatures (226 data points) gave the Arrhenius expression (k +- 1sigma) = (8.05 +- 5.69) x 10/sup -12/ exp (-193 +- 194/T) cm/sup 3/ s/sup -1/ with covariance 1.098 x 10/sup -9/. A simple weighted average (temperature independent) fits the data just as well, and when the effects of systematic errors are taken into account, our recommended rate constant is (k +- 2sigma) = (4.0 +- 1.6) x 10/sup -12/ cm/sup 3/ s/sup -1/.
- Research Organization:
- SRI International, Menlo Park, CA
- OSTI ID:
- 6770587
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 86:9; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
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CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
EXPERIMENTAL DATA
FLUORESCENCE
HIGH TEMPERATURE
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
HYDROXYL RADICALS
IMPURITIES
INFORMATION
INORGANIC ACIDS
KINETICS
LOW PRESSURE
LUMINESCENCE
NITROGEN COMPOUNDS
NUMERICAL DATA
OXYGEN COMPOUNDS
OZONE
PEROXIDES
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
REACTION KINETICS
TEMPERATURE EFFECTS