Thermoreflectance of Graphite

Abstract
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.