Low-energy electron collisions with tetrafluoroethene, C_2F_4

Abstract

We report calculated cross sections for elastic and inelastic collisions of low-energy electrons with tetrafluoroethene, C_2F_4. The elastic cross section shows a number of resonance features, which we classify according to symmetry and analyze in relation to available experimental data. Electron-impact excitation cross sections are obtained for the 1^3B_(1u)(T) and 1^1B_(1u)(V) states arising from the π→π* transition, as well as for eight other low-lying excited states arising from excitations out of the highest occupied molecular orbital. As expected, the T and V states make the largest individual contributions to electron-impact excitation at low energies; however, the other states are shown to contribute significantly to the total excitation cross section at impact energies from 10 to 25 eV.

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