Rate of decomposition of hexafluoroazomethane and the absolute rate of recombination of trifluoromethyl radical at higher temperatures

The unimolecular homogeneous decomposition of hexafluoroazomethane was studied in a VLPP apparatus in the temperature range 720–1050 K and is consistent with the following Arrhenius parameters:\documentclass{article}\pagestyle{empty}\begin{document}$$ \log k(\sec ^{ - 1}) = 16.2 - 55.2/\theta $$\end{document}at 900 K, where the A factor was assumed to be the same as for 2,2′‐azoisobutane. The homogeneous rate of recombination of ·CF 3 radicals at temperatures around 1000 K was also studied under VLPP conditions and was found to be in the fall‐off region, corresponding to k / k ∞ = 8.5 × 10 −3 when a rotational transition‐state model was used. This model predicts an essentially constant value of k r ∞ of 10 9.7 over the temperature range 300–1000 K.