Photoabsorption spectra of graphite at photon energies between 275 and 345 eV are presented. The spectra show dramatic changes as the angle, {α}, between the Poynting vector and the surface normal is varied. By varying {α}, one is able to select the symmetry of the final state ({σ} or {π}). Using this information, we are able to assign the spectral features to states predicted by published band-structure calculations.
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Rosenberg et al. (1986) studied this question.
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