Abstract
Angle-resolved secondary electron emission excited by electrons has been used to map out the unoccupied bands of graphite single crystal. Highly dispersive structures are observed in the low kinetic energy region (0–30 eV) of the electron yield collected along the Γ-M and Γ-K lines of the two-dimensional Brillouin zone. The experimental bands are in very good agreement with recent band structure calculations. The different behaviour of the observed dispersion lines along Γ-M and Γ-K supports that effects due to single crystal of graphite are detected. Particularly, the splitting of the 2s2p xy band (∼ 3 eV kinetic energy) along the Γ-M direction has been clearly observed for the first time. The use of angular resolved spectroscopy of secondary electrons for investigating the band structures of two-dimensional systems above the vacuum level has been established as a powerful and straightforward technique.
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