The ignition of ethylene-oxygen mixtures highly diluted with argon was studied in a shock tube by monitoring the emission from CH* and C2* or OH*. The measurements covered the temperature range of 1400–2100 K at the C2H4/O2 ratios of 0.33–1.00. From the observation of the CH*, C2*, and OH* emissions, a mechanism for the production of chemiluminescent species upon ethylene oxidation was briefly discussed, and from the observation of the induction period of the CH* emission, the following equation was found: logτ_CH[O_2]=-11.45+27.5×10^3/4.58T in units of s mol l−1, the rate-determining step being C2H3+O2→C2H3O+O.
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Hidaka et al. (1974) studied this question.
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