Rate constants for the reactions of HO/sub 2/ with OH and with HO/sub 2/

Journal Article · Mon Dec 31 23:00:00 EST 1979 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100461a029· OSTI ID:5826799

Hochanadel, C J ^[1]; Sworski, T J; Ogren, P J

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1. Oak Ridge National Lab., TN

Hydroperoxyl radicals are generated by the flash photolysis of H/sub 2/O vapor in systems containing 2% O/sub 2/ and either CO or He. Observation of HO/sub 2/ decay kinetics at 220 nm coupled with knowledge of the H/sub 2/O dissociation yield permits a direct evaluation of epsilon/sub HO/sub 2//, k/sub 5/(HO/sub 2/ + HO/sub 2/), and k/sub 6/(HO/sub 2/ + OH). For system conditions of 1 atm, 296/sup 0/K, and 21 torr of H/sub 2/O, the results are the following: epsilon/sub max/ = (1050 +- 140) M/sup -1/ cm/sup -1/ at 205 nm, k/sub 5/ = (4.0 +- 0.7) x 10/sup 9/ M/sup -1/ s/sup -1/, and k/sub 6/ = (7.0 +- 1.5) x 10/sup 10/ M/sup -/ s/sup -1/. Comparisons with other reported values, including our own previous work, are discussed in terms of pressure effects, the effect of H/sub 2/O on k/sub 5/, and the possible reaction products of the HO/sub 2/ self-reaction. 1 figure, 4 tables.

• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5826799
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 84:24; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
DISSOCIATION
ELEMENTS
FLUIDS
GASES
HELIUM
HYDROGEN COMPOUNDS
HYDROPEROXY RADICALS
KINETICS
MEDIUM PRESSURE
MEDIUM TEMPERATURE
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
RARE GASES
REACTION KINETICS
VAPORS
WATER
WATER VAPOR