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The splitting of the π bands in graphite due to multilayer interaction has been observed directly for the first time for the valence-band states at P and Q on the vertical face of the Brillouin zone, using photoemission techniques. The splitting is found to be 0.8±{}0.1 eV for both P and Q, giving a value of 0.42 eV for the parameter γ₁, in agreement with other experiments.
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Feuerbacher et al. (1971) studied this question.
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