A flash photolysis–resonance fluorescence study of the O+C2H2 and O+C2H3Cl reactions

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Abstract
The kinetics of the reactions O+C2H2 and O+C2H3Cl have been studied at room temperature by the flash photolysis–resonance fluorescence technique. In the O+C2H2 case the measurements were complicated by a strong background chemiluminescence in the vacuum ultraviolet which had to be subtracted from the total observed photon count. The overall O+C2H2 rate constant based on the measured O decays (at 297±1°K) was 7.2±0.2×1010 cm3 mole−1⋅s−1. The chemiluminescent backgrounds were interpreted in terms of a suggested mechanism in the literature, and the O+C2H2 rate constant derived from the chemiluminescent decays was 8.2±0.2×1010. The measured overall O+C2H3Cl rate constant (much less complicated by background chemiluminescence) was 4.1±0.1×1011. Comparisons with literature data are made.