REFLECTION ELECTRON-ENERGY-LOSS SPECTRA OF THE FULLERENES C-60 AND C-70

High purity polycrystalline samples of C-60 and C-70 studied by the el ectron energy-loss spectroscopy in the reflection mode. The spectra we re used for determination of the loss functions of fullerenes. Loss fu nctions of the fullerenes were compared with those of graphite. It was established that the relative intensities of the peaks corresponding to (sigma+pi)- and pi-plasmons depended on the primary electron energy , while the (sigma+pi)-plasmon energies did not depend on the primary electron energy and were equal to 25.0 eV for C-60 and 24.8 eV for C-7 0. The conclusion on the space localization for plasma occilations in fullerenes was made on the base of the study of the energy dependent l oss functions.