The thermoreflectance of graphite has been measured in the energy range 4.4 to 5.5 eV at 80^∘{}K. Three peaks at 4.52, 4.76, and 4.82 eV have been identified as M₁-type singularities and assigned to transitions taking place at the points Q and L in the Brillouin zone.
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Anderegg et al. (1971) studied this question.
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