Rate constant and possible pressure dependence of the reaction OH + HO/sub 2/

Journal Article · Thu Jan 07 04:00:00 EST 1982 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100390a025· OSTI ID:5453278

DeMore, W B

The technique of laser-induced fluorescence has been used to measure steady-state OH concentrations in the photolysis of water vapor at 184.9 nm and 298 K, with O/sub 2/ added in trace amounts. He or Ar was present at total pressures in the range 75-730 torr. The results were used to derive the rate-constant ratio k/sub 1//k/sub 5//sup 1///sup 2/, where k/sub 1/ and k/sub 5/ are the rate constants for the reactions OH + HO/sub 2/ ..-->.. H/sub 2/O + O/sub 2/ and HO/sub 2/ +HO/sub 2/ ..-->.. O/sub 2/, respectively. When currently available values for k/sub 5/ are used, the results give k/sub 1/ = (1.2 +/- 0.4) X 10/sup -10/ cm/sup 3/ s/sup -1/ at 1-atm pressre, with evidence of a decline of k/sub 1/ at lower pressure. No water-vapor effect on k/sub 1/ was observed.

• Research Organization: California Inst. Tech., Pasadena
• OSTI ID: 5453278
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 86:1; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400500 -- Photochemistry
400600* -- Radiation Chemistry
ARGON
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
FLUORESCENCE
GASES
HELIUM
HYDROPEROXY RADICALS
HYDROXYL RADICALS
INFORMATION
KINETICS
LOW PRESSURE
LUMINESCENCE
NONMETALS
NUMERICAL DATA
OXYGEN
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PRESSURE DEPENDENCE
RADICALS
RARE GASES
REACTION KINETICS
VAPORS
WATER VAPOR