Selected ion flow tube study of the reactions of O- and O-2(-) with CHCl2F, CHClF2, CHF3, CH2ClF, CH2F2 CH3F, CHF2CHF2, CH2FCF3, and CH3CHF2

In this paper we report the reactions of O- and O2- with several saturated hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) in a 0.5 Torr helium buffer gas at about 300 K using a selected ion flow tube. The reaction rate coefficients and branching ratios determined for the large number of reactions studied are presented. O- is found to react with all the molecules studied, and several distinct reaction processes are observed. These include nucleophilic attack on chlorine, nucleophilic attack on carbon, and hydrogen, proton, and H2+ abstraction. Nucleophilic attack on carbon is found to dominate the O2- reactions with the HCFCs. Bimolecular reactions of O2- with the HFCs do not occur. © 1997 Elsevier Science B.V.