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Surface-bulk core-level splitting in graphite

2001; American Physical Society; Volume: 64; Issue: 20 Linguagem: Inglês

10.1103/physrevb.64.205420

1095-3795

T. Balasubramanian, J. N. Andersen, L. Walldén,

Surface and Thin Film Phenomena

Photoemission from highly oriented pyrolytic graphite reveals two C $1s$ components separated in binding energy by 120 meV. The high binding-energy component is ascribed to atoms in the outermost atomic layer and the other to deeper layers. The interpretation is based on the low relative intensity observed for the low binding-energy line at photon energies chosen such that excitation beneath the surface layer is suppressed by a bulk band gap at the energy of the final state. The surface emission line, which dominates, is slightly asymmetric and has a Lorentzian width of 160 meV (full width at half maximum).