Previous: Ext. Abst. Next: Experimental details Up: Ext. Abst.

Introduction

In the last teen years, it has been of great interest to know the impact of the substitutes of CFCs and their degradation products on atmospheric chemistry. In fact, the radicals CF₃O_x and FCO_x originated from the decomposition of HFCs are involved in many reactions in the higher atmosphere.

In previous works, the reaction between CF₃ and FCO radicals,^1,2 obtained when CF₃COF is photolyzed was studied.. Both radicals react to give C₂F₆, CO, CF₂O and also to regenerate the precursor molecule, thus giving a quantum yield of CF₃COF disappearance lower than unity (f =0.4). Similarly, the quantum yield of CF₃CF₂COF photolysis gave the same value as that for the CF₃COF,³ but there were no indication about the kinetics of the reaction.

Taking into account the above results, we performed the photolysis of CF₃CF₂COF alone and in the presence of either c-C₆H₁₂ or (FCO)₂ in order to know the mechanism which is taking place and to determine the C₂F₅ and FCO radical recombination rate.