Absolute Rate Constants for the Reactions of O(3P) Atoms with C2H4 and C2D4

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Abstract
Rate constants for the reactions of O(3P) with C2H4 and with C2D4 were determined at 298±2°K using pulsed vacuum-uv photolysis. Both NO2* and CO2* chemiluminescence were used to monitor decays of O atoms. The decay rates of O atoms in the presence of a large excess of C2H4 or C2D4 were independent of the initial concentration of O atoms in the range of approximately 109–1012 O atoms cm−3 and were linearly dependent on the reactant concentration. From these measurements, rate constants were determined to be 6.25 (± 0.63)× 10−13 cm3 molecule−1 · sec−1 for O+C2H4, and 5.6 (± 0.56)× 10−13 cm3 molecule−1· sec−1 for O+C2D4. The present value for O+C2H4 agrees well with that measured previously in this laboratory and confirms the validity of the pulsed vacuum-uv photolysis-chemiluminescence method.