Rate constants of the combination of methyl radicals with nitric oxide and oxygen

Rate constants for the combination of methyl radicals with NO and O 2 have been measured by flash photolysis of azomethane coupled with product analysis by gas chromatography. Values of the rate constants have been obtained over the pressure region from 50 to 700 torr with He, N 2 , and Ar as quenching molecules. The high‐pressure limits were obtained through an RRKM model calculation and were found to be The rate constants were measured relative to the methyl combination reaction k 1 with k 1 = 9.5 × 10 −11 cm 3 /molec · sec. The RRKM model suggests D 0 (CH 3 O 2 ) = 32 ± 3 kcal/mole.