Unoccupied electronic states of single-crystal graphite by angle-resolved ultraviolet inverse photoemission

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Abstract
The unoccupied electronic states of a single crystal of natural graphite have been measured by angle-resolved inverse photoemission, with tunable photon energies in the range 14–26 eV. The normal-incidence data suggest that the interlayer band minimum probably lies at ∼5 eV above the Fermi level. An image-potential state is observed at 3.9 eV above the Fermi level along ΓA, existing in the gap below the interlayer state. The absence of turbostratic disorder has allowed unam- biguous determination of the distinct conduction-band dispersions in the two principal symmetry directions, ΓALM and ΓAHK, up to 15 eV above the Fermi level.