Electron attachment to thermally excited trichlorotrifluoroethane (1, 1, 2-)

Abstract

Electron attachment to trichlorotrifluoroethane (1, 1, 2-) was investigated in buffer gases of and Ar using a high-temperature electron swarm apparatus. The negative ion intensity was also measured as a function of electron energy using an electron beam apparatus. The electron attachment rate constant, , was measured in the mean electron energy range, , 0.043 to 4.7 eV and over a temperature, T, range 300 to 700 K in the electron swarm experiments. The electron attachment rate constant was found to first increase slightly with increasing temperature and subsequently decrease for K. Our room-temperature electron beam study showed that 1, 1, 2- attaches electrons predominantly via dissociative negative ion states and revealed that the electron attachment cross section exhibits three main peaks: one at eV producing , a second one at eV due to and a third one at eV also producing . The electron attachment cross sections obtained using an electron swarm-unfolding technique show that the peak at eV observed in the electron beam study is actually composed of three peaks; one at eV and two more at higher electron energies but below 1.5 eV.