Chemical synthesis induced by dissociative electron attachment

CHED 953

Lin Zhu, lzhu@wellesley.edu1, Mahesh Rajappan, mrajappa@wellesley.edu1, Chris Arumainayagam1, Andrew Bass2, and Leon Sanche, Leon.Sanche@USherbrooke.ca2. (1) Department of Chemistry, Wellesley College, Wellesley, MA 02481, (2) Dept. of Nuclear Medicine & Radiobiology, University of Sherbrooke, 3001, 12e Avenue Nord, Sherbrooke, QC J1H 5N4, Canada

We have investigated the electron-induced reactions of condensed CF2Cl2 at subexcitation electron energies under ultrahigh vacuum conditions. Results of post-irradiation temperature-programmed desorption experiments were used to quantify the electron-induced radiolysis products (C2F4Cl2, C2F3Cl3, and C2F2Cl4) of CF2Cl2 as functions of electron energy and electron fluence. While previous gas and condensed phase CF2Cl2 experiments show a resonance in the production/desorption of the F- ion at incident electron energies of 3 eV and 4 eV, respectively, our post-irradiation data demonstrate a resonance in the production of the complementary •CFCl2 radicals at 3 eV. Furthermore, our results, which do not show a resonance in the production of •CF2Cl radicals, are consistent with the absence of a resonance in the production/desorption of Cl-. While numerous studies have revealed chemical damage induced by dissociative electron attachment, our results represent one of the first studies to unambiguously demonstrate chemical synthesis induced by dissociative electron attachment.