Laser magnetic resonance, resonance fluorescence, and resonance absorption studies of the reaction kinetics of O + OH. -->. H + O/sub 2/, O + HO/sub 2/. -->. OH + O/sub 2/, N + OH. -->. H + NO, and N + HO/sub 2/. -->. products at 300 K between 1 and 5 torr
A new tandem axis, laser magnetic resonance-resonance fluorescence-resonance absorption, fast flow system is used to examine the kinetics of four reactions in the oxygen-nitrogen-hydrogen free radical system. The experimental approach emphasizes simultaneous detection of reactants and products, cross calibration of detection axes, multiple sources for free-radical-formation steps, and computer simulation of the time dependence of reactants and products through the course of each reaction. Rate constants are reported as follows: OH + O ..-->.. H + O/sub 2/, (3.1 +/- 0.5) X 10/sup -11/ cm/sup 3/ molecule/sup -1/ s/sup -1/; HO/sub 2/ + O ..-->.. OH + O/sub 2/, (5.2 +/- 0.8) X 10/sup -11/ cm/sup 3/ molecule/sup -1/ s/sup -1/; OH + N ..-->.. H + NO, (4.2 +/- 0.8) X 10/sup -11/ cm/sup 3/ molecule/sup -1/ s/sup -1/; HO/sub 2/ + N ..-->.. products, (2.2 +/- 0.5) X 10/sup -11/ cm/sup 3/ molecule/sup -1/ s/sup -1/. Cited uncertainties are 95% confidence limits and include consideration of possible systematic errors. All experiments were done in helium or argon at 300 K and pressures between 1 and 5 torr. 10 figures, 7 tables.
- Research Organization:
- Harvard Univ., Cambridge, MA
- OSTI ID:
- 6855676
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 87:22
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HYDROPEROXY RADICALS
CHEMICAL REACTION KINETICS
HYDROXYL RADICALS
OXYGEN
ABSORPTION
ATOMS
CALIBRATION
CARBON DIOXIDE LASERS
COMPUTERIZED SIMULATION
EXPERIMENTAL DATA
INFRARED RADIATION
LASER RADIATION
LOW PRESSURE
MEDIUM TEMPERATURE
OPERATION
PHOTOCHEMICAL REACTIONS
PHOTOIONIZATION
PRESSURE DEPENDENCE
RESONANCE
RESONANCE FLUORESCENCE
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
CHEMICAL REACTIONS
DATA
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUORESCENCE
GAS LASERS
INFORMATION
IONIZATION
KINETICS
LASERS
LUMINESCENCE
NONMETALS
NUMERICAL DATA
RADIATIONS
RADICALS
REACTION KINETICS
SIMULATION
400600* - Radiation Chemistry
400500 - Photochemistry