C 1sautoionization study of electron hopping rates in solidC60

We present C 1s autoionization studies of condensed and Xe matrix-isolated ${\mathrm{C}}_{60}$ molecules which give direct information on electron hopping rates in solid ${\mathrm{C}}_{60}$ in the presence of a C 1s vacancy. These rates vary dramatically for the first three C 1s absorption excitation maxima in a pattern consistent with strong electron-electron correlations. Hopping associated with the second excited state involves extramolecular screening comparable to the Mott-Hubbard pseudogap predicted for ${\mathrm{K}}_3$ ${\mathrm{C}}_{60}$, suggesting intramolecular correlations do not dominate electron transport in the alkali fullerides.