Determination of charge states ofC60adsorbed on metal surfaces

Abstract
The charge transfer per molecule in a C60 monolayer on Au(110), on K/Au(110)c(2×2), and on a K multilayer has been determined by studying the electronic excitations from the valence bands and from the C 1s core level and the vibrational modes of the systems by electron energy loss spectroscopy. The electrons transferred are 1±1, 3±1, and 6±1, respectively. These results indicate strong chemical bonding of C60 on such metal surfaces.