Abstract
Recombination in the hydrogen-oxygen reaction has been studied by monitoring the growth of infrared emission at 2.7 μ from water vapor formed during the shock-initiated combustion of dilute H2-O2-Ar mixtures. Experiments were carried out with hydrogen/oxygen ratios between 2.2 and 0.33 and temperatures between 1435 and 1868°K. The proportionality between emission intensity and [H2O] was confirmed under these conditions by shocking mixtures of water vapor in argon. In H2-lean mixtures analysis of the recombination emission profiles gave a value for the rate coefficient of the dominant termolecular reaction, H + O2 + Ar → HO2 + Ar (3.0 × 1015 cc2/mole2 sec), that is in good agreement with other shock tube determinations. Profiles in near-stoichiometric mixtures agreed quite well with predictions based on recent ultraviolet absorption measurements of the time dependence of the OH concentration during combustion. These results provide convincing evidence of the validity of the present understanding of recombination in the hydrogen-oxygen reaction.
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