Abstract
The absorption spectra of C2, C3, and CH have been studied quantitatively in the mantle and reaction zone of rich oxy-acetylene flames. A specially designed multiple reflection system has been used to increase the effective optical path. Concentrations of C2 and C3 in the mantle, about 2×1014 and 1×1015 molecules/cc, respectively, are consistent with values expected for equilibrium with solid carbon but the concentrations of C2 and CH are much higher in the reaction zone. We conclude that C3 is probably formed from evaporation of incipient particles of solid carbon, but that in these hot flames, C2 radicals may serve as nuclei for carbon formation.
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