BAND DISPERSION AND EMPTY ELECTRONIC STATES IN SOLID C60 - INVERSE PHOTOEMISSION AND THEORY

Inverse-photoemission studies of the empty electronic states of solid C60 show ten features within 15 eV of the lowest empty state. Pseudopotential calculations identify the character of the empty states. Band calculations for fcc C60 demonstrate that dispersion of some of the states, due to intermolecular interaction, reproduces experimental results. Intensity variations of experimental features with incident electron energy reflect their pi and sigma-character as well as their symmetries. Resonant coupling is observed between the inverse-photoemission decay channel involving the third feature and the radiative decay of a plasmon.