Selected ion flow tube study of the reactions of O − and O 2− with CHC1 2F, CHC1F 2, CHF 3, CH 2C1F, CH 2F 2, CH 3F, CHF 2CHF 2, CH 2FCF 3, and CH 3CHF 2

Abstract

In this paper we report the reactions of O − and O 2 − 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 H 2 + abstraction. Nucleophilic attack on carbon is found to dominate the O 2 − reactions with the HCFCs. Bimolecular reactions of O 2 − with the HFCs do not occur.