OH (2Σ — 2Π) emission was studied in 1500-2800°K incident shock waves through low-pressure H2-O2-Ar mixtures with 100-fold variation in H2/O2 ratio. The transition from chemiluminescent to thermal excitation was found to occur near 2000-2200°K for these conditions. Intensities measured during the exponential growth period and in the partial equilibrium state following combustion were correlated with possible elementary reactions producing OH(2Σ).
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Gardiner et al. (1969) studied this question.
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