High-resolution electron energy-loss spectra show unexpected features of electronic excitations in stage-1 FeCl₃-intercalated graphite. A sharp 1-eV plasmon surprisingly exhibits positive quadratic dispersion and damping characteristic of a free three-dimensional electron gas. However, the dispersion coefficient is very large and the intensity falls unusually sharply with increasing momentum, indicating the likelihood of strong band-structure effects. An intense 5.9-eV energy loss is identified with a shifted π plasmon in graphite consistent with only weakly perturbed carbon π bands.
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Ritsko et al. (1979) studied this question.
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