Rate constant for the reaction CH3+CH2(X̃3B1) at 298 K

Abstract

AbstractThe rate constant for the reaction between CH3 and CH2 (X̃3B1 = 3CH2) radicals, was determined at T=298 K and p=1.33 mbar in an isothermal discharge flow reactor. Far Infrared Laser Magnetic Resonance (FIR‐LMR) was employed for monitoring 3CH2 and CH3 radical concentration‐versus‐time profiles. CH3 was determined in the form of NO via the conversion reaction CH3+NO2 → CH3O+NO. The CH3 and 3CH2 radicals were generated by the reactions F+CH4 → CH3+HF and F+CH3 → 3CH2+HF. The rate constant for the recombination reaction was determined together with the rate constant for reaction (1). The measurements gave a rate constant value for reaction (1) of k1 = (6.5±1.2)·1013 cm3/mol s.