Abstract
Ionization efficiency curves for positive and negative ions in perfluorocyclobutane were determined by the retarding potential difference method. Ionization efficiency curves for selected negative ions from CF 4, C 2F 4, C 3F 6, and 2-C 4F 8 (perfluorobutene-2) were determined as well. Appearance potentials are employed to calculate CF bond energies, as well as ionization potentials and electron affinities of the radicals involved. The carbon-fluorine bond dissociation energy in perfluorocyclobutane is estimated to be 4.4 ± 0.2 eV. The following electron affinities were calculated (in eV): C 2F 3, 2.0 ± 0.4; C 3F 5, 2.6 ± 0.4.
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