Abstract
High resolution electron energy loss spectroscopy has been used to investigate the vibrational and electronic excitations of single-phase, crystalline AxC60 films. Substantial changes in intramolecular mode frequencies and intensities with alkali concentration arise from charge transfer effects as well as free carrier screening. For x=4, splitting of the tu band is observed, resulting in an insulating phase with an estimated gap of 0.3-0.4eV. Screening in the x=3 phase results in enhanced surface sensitivity and deviations from bulk stoichiometry at the surface of metallic films are observed.
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Lopinski, G.P., Mitch, M.G., Chase, S.J. et al. HREELS Studies of KxC60 Thin Films. MRS Online Proceedings Library 359, 301–306 (1994). https://doi.org/10.1557/PROC-359-301
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DOI: https://doi.org/10.1557/PROC-359-301