Lattice Absorption Bands in SiC

Using four phonon energies, $TA=0.045$, $LA=0.067$, $TO=0.0955$, and $LO=0.1055$ ev, it is possible to explain, as summation bands, the ten absorption bands lying in the energy range 0.130 to 0.300 ev. Phonon energies close to three of the four given here have been obtained by an analysis of the indirect interband absorption in SiC.