Absolute Yields of CO, CO2, and H2CO from the Reaction CH2(3B1) + O2 by IR Diode Laser Flash Kinetic Spectroscopy

Article abstract of DOI:10.1021/j100052a029

The absolute yields of the stable carbo-containing products CO, CO2, and H2CO formed in the reaction of triplet methylene (<*>³B_!<*>CH2) with O2 have been determined using a flash kinetic spectrometer.CH2 radicals were generated by excimer laser photolysis of ketene, and product formation was monitored by time-resolved infrared diode laser absorption.The reaction was carried out in a static gas cell at room temperature (T = 298 +/- 3 K) with total pressures in the range 1-25 Torr.The meassured product yields were as follows: CO, 0.34 +/- 0.06; CO2, 0.40_-0.07^+0.09; H2CO, 0.16 +/- 0.04.The rate constants for production of CO and CO2 were equivalent to the published rate constant for removal of CH2.Additionally, indirect evidence indicated that the yield of OH is 0.30 +/- 0.05.