NOT KNOWN FACTS ABOUT BAGA4SE7 CRYSTAL

′�?, which has a frequency of 295 cm−1, is attributed towards the stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−1 phonon corresponds to the crystal IR absorption edge, instead of the residual absorption peak. Density functional concept computations show that the residual absorption with the BGSe crystal orig