Difluorocarbene has been identified in methane-oxygen-argon flames initially containing less than or equal to 1 pct cf3br and burning at 0.04 Atm. Profiles of the concentration of this species (maximum 1014 molecules cm-3) through the reaction zone of the flame have been determined, and from these, profiles of the net chemical reaction rates have been calculated. These data, combined with knowledge of the complete microstructure of the flames studied, suggest that cf2 is formed in this flame principally by the reaction cf3 + h -> hf + cf2(2), and k2 = 2 x 1014 cm3 mo1-1s-1 at 1540 k. The decay of cf2 is via reactions with the major flame radicals, cf2 + (o, h, oh) -> products, with rate constants of the order of (1-5) x 1013 cm3 mo1-1s-1. The implication of these reactions for the mechanism of flame inhibition by fluorocarbons is discussed.
J. Phys. Chem., V. 80, No. 10, 1976, PP. 1042-1048