Inelastic x-ray scattering studies of single-crystal graphite with the direction of →k, the momentum transfer, parallel or perpendicular to the C axis reveal a significant qualitative difference in the $|k|$ dependence of the plasmon mode. The results along the A axis are similar to and reveal the same anomalies as those previously reported for Li, Be, Al, and Si. The C-axis results, however, are in semiquantitative agreement with mean-field-theory predictions.
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Eisenberger et al. (1976) studied this question.
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