Abstract :
[en] Our purpose was to investigate the resonant vibrational excitation of furan (C4H4O) in its electronic ground state by electron collisions. The electron energy loss measurements have been carried out at intermediate and low impact energies for a scattering angle of 30°. The spectra show peaks or groups of peaks corresponding to the excitation of the fundamental normal modes as also of the first harmonics and combinations. The energy dependence curve for the excitation of the C-H stretching vibrational modes is also reported for the impact energy range of 3-10 eV. It exhibits a broad structureless band with a maximum centered around 6 eV, which reveals an excitation mechanism through the intermediate of a shape resonance built on the electronic ground state of the neutral molecule. A comparison with benzene is made in order to help the analysis and to assign the nature as well as the symmetry of the resonance. © 1996 American Institute of Physics.
Tollet, Françoise ;
Université de Liège > Direction administrative de la faculté des sciences Eustatiu, G.; Laboratoire de Physique Atomique et MolÉculaire, Département de Physique, Université Laval, Qué., G1K 7P4, Canada
Roy, D.; Department of Chemistry, McMaster University, Hamilton, Ont., L8S 4M1, Canada
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