Direct Investigation of the Reaction CH2(X̃3B1) + O(3P) with the LMR

The reaction has been studied at room temperature in an isothermal discharge flow reactor. Methylene-radicals and oxygen-atoms have been monitored with a Far-Infrared Laser Magnetic Resonance spectrometer. The rate constant of reaction (1) was evaluated from the pseudo first order decay of CH2 in the presence of a large excess of O-atoms. The influence of side and consecutive reactions has been investigated in a computer simulation of the reaction system. — The final result for the rate constant of reaction (1) is The experimental value is compared to theoretical predictions for the high pressure recombination rate constant of CH2 and O.

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