RESONANCE EFFECTS OBSERVED IN THE INTERACTION OF LOW-ENERGY ELECTRONS AND INTRAMOLECULAR VIBRATIONS OF SOLID C70

Abstract

The intramolecular vibrations of a thick epitaxial C 70(111) film on GeS (001) have been measured by high-resolution electron energy-loss spectroscopy (HREELS). A negative-ion resonant behavior is observed in the energy dependence of the impact scattering differential cross sections. These resonances are described as electronic excitation associated shape resonances, which are coincident with the electron energy loss and free-electron capture experiments. Finally, the effect of charge transfer on the resonance behavior is discussed through the comparison of bulk spectra with those from an adsorbed monolayer of C 70 on Au (110).