Abstract

The pyrolysis of C2HF5 and C3HF7 have been studied in shock waves by monitoring die UV-absorption of CF2 at 248nm and temperatures in the range of 1400 - 2000 K. Ar was used as bath gas with concentrations in the range (2-10) x 10^-5 mol cm^-3. It is shown that the reactions are initiated by C-C bond fission and differing conclusions in the literature can be explained with falloff effects. Quantum-chemical calculations were employed to model the kinetic of primary and secondary reactions in the decomposition mechanisms.

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