High energy excited states of graphene adsorbed on Ni(111)

We report on measurements of energy distributions of secondary electrons emitted by graphene adsorbed on a Ni(111) surface. The spectra allow extracting the dispersions of the unoccupied electronic bands of the system along a specific high symmetry direction of the Brilluoin zone. These dispersions are compared and shown to be consistent with previous investigations on graphite samples. Some nickel derived features, which can be detected in the same spectra, call for more detailed band structure calculations.