A SIMPLE KEY FOR BAGA4SE7 CRYSTAL UNVEILED

′�?, by using a frequency of 295 cm−1, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−1 phonon corresponds for the crystal IR absorption edge, in lieu of the residual absorption peak. Density practical theory computations show which the residual absorption with the BGSe crystal originates