Abstract
AbstractThe reaction between CH2‐radicals in the triplet electronic ground state X˜3B1 (3CH2) and C2H4 was studied in the gas phase at temperatures between 296 K ≤ T ≤ 728 K in an isothermal discharge flow system. CH2‐radicals were generated either in the reaction O + CH2CO or by exciplex laser photolysis of CH2CO. Their concentration was monitored with a far infrared Laser Magnetic Resonance spectrometer. The experimental rate constant obtained from the pseudo first order decay of 3CH2 in the presence of a large excess of C2H4 was found to be Correcting for the small contribution to the depletion of 3CH2 due to collisional excitation to the singlet first excited state ã1A1(1CH2) followed by consecutive reactions of 1CH2, the rate constant for the direct reaction of 3CH2 with C2H4 was obtained to be A reaction mechanism describing both the present data as well as the results of earlier related‐studies in the CH2 + C2H4 system is proposed. The mechanism and product yields are discussed in terms of unimolecular rate theory.
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