Band dispersion and empty electronic states in solid ${\mathrm{C}}_{60}$: Inverse photoemission and theory

Inverse-photoemission studies of the empty electronic states of solid ${\mathrm{C}}_{60}$ show ten features within 15 eV of the lowest empty state. Pseudopotential calculations identify the character of the empty states. Band calculations for fcc ${\mathrm{C}}_{60}$ 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 π and σ 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.