Kinetics and mechanism of HO/sub 2/ and DO/sub 2/ disproportionations
Journal Article
·
· J. Phys. Chem.; (United States)
The HO/sub 2/ + HO/sub 2/ and DO/sub 2/ + DO/sub 2/ reactions in the gas phase have been studied by the flash photolysis/UV absorption technique. Rate constants were measured at pressures between 100 and 700 torr of Ar and N/sub 2/ at temperatures between 230 and 420 K, and with up to 10 torr of added water vapor. The overall disproportionation rate constant can be expressed as the sum of pressure-independent and pressure-dependent terms. The experimental uncertainty in k/sub 1/ and k/sub 2/, including systematic errors, is 25% (one standard deviation). The enhancement of the HO/sub 2/ + HO/sub 2/ rate constant in the presence of added water vapor was studied over the temperature range 250-298 K and found to contribute a multiplicative term (1 + 1.4 x 10/sup -21/ exp(2200/T)(H/sub 2/O)) to the rate constant expressions. The mechanism of the HO/sub 2/ + HO/sub 2/ reaction was investigated with a two-channel RRKM model which suggested that the binding energy of the HO/sub 4/H intermediate lies in the range of 12-20 kcal mol/sup -1/ relative to HO/sub 2/ reactants. 35 references, 8 figures, 7 tables.
- Research Organization:
- California Inst. of Tech., Pasadena
- OSTI ID:
- 6695924
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:10; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Kinetics studies of the HO/sub 2/ + HO/sub 2/ and DO/sub 2/ + DO/sub 2/ reactions at 298/sup 0/K
Rate constant and possible pressure dependence of the reaction OH + HO/sub 2/
Pressure dependence of the rate constant for the reaction HO/sub 2/ + NO/sub 2/ + M. -->. HO/sub 2/NO/sub 2/ + M (M = N/sub 2/, O/sub 2/) at 298 K
Journal Article
·
Wed Apr 14 23:00:00 EST 1982
· J. Phys. Chem.; (United States)
·
OSTI ID:6628468
Rate constant and possible pressure dependence of the reaction OH + HO/sub 2/
Journal Article
·
Wed Jan 06 23:00:00 EST 1982
· J. Phys. Chem.; (United States)
·
OSTI ID:5453278
Pressure dependence of the rate constant for the reaction HO/sub 2/ + NO/sub 2/ + M. -->. HO/sub 2/NO/sub 2/ + M (M = N/sub 2/, O/sub 2/) at 298 K
Conference
·
Wed Jan 29 23:00:00 EST 1986
· J. Phys. Chem.; (United States)
·
OSTI ID:5816254
Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ABSORPTION SPECTROSCOPY
ARGON
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CORRELATIONS
DATA
DATA ANALYSIS
ELECTROMAGNETIC RADIATION
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
HIGH TEMPERATURE
HYDROPEROXY RADICALS
INFORMATION
KINETICS
LOW PRESSURE
LOW TEMPERATURE
MATHEMATICAL MODELS
MEDIUM TEMPERATURE
NITROGEN
NONMETALS
NUMERICAL DATA
OXIDATION
PRESSURE DEPENDENCE
RADIATIONS
RADICALS
RARE GASES
REACTION KINETICS
REDUCTION
SPECTRA
SPECTROSCOPY
TEMPERATURE DEPENDENCE
ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTRA
400500* -- Photochemistry
ABSORPTION SPECTROSCOPY
ARGON
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CORRELATIONS
DATA
DATA ANALYSIS
ELECTROMAGNETIC RADIATION
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
HIGH TEMPERATURE
HYDROPEROXY RADICALS
INFORMATION
KINETICS
LOW PRESSURE
LOW TEMPERATURE
MATHEMATICAL MODELS
MEDIUM TEMPERATURE
NITROGEN
NONMETALS
NUMERICAL DATA
OXIDATION
PRESSURE DEPENDENCE
RADIATIONS
RADICALS
RARE GASES
REACTION KINETICS
REDUCTION
SPECTRA
SPECTROSCOPY
TEMPERATURE DEPENDENCE
ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTRA