Laser Magnetic Resonance, Resonance Fluorescence, and Resonance Absorption Studies of the Reaction Kinetics of O + OH -> H + O2, O + HO2 -> OH + O2, N + OH -> H + NO, and N + HO2 -> Products at 300 K between 1 and 5 torr

Article abstract of DOI:10.1021/j100245a034

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 + O2, (3.1+/-0.5)*10^-11 cm³ molecule^-1 s^-1; HO2 + O -> OH + O2, (5.2+/-0.8)*10^-11 cm³ molecule^-1 s^-1; OH + N -> H + NO, (4.2+/-0.8)*10^-11 cm³ molecule^-1 s^-1; HO2 + N -> products, (2.2+/-0.5)*10^-11 cm³ molecule^-1 s^-1.Cited uncertainties are 95percent 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.