CONSIDERATIONS TO KNOW ABOUT BAGA4SE7 CRYSTAL

′�?, with a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption of the 295 cm−1 phonon corresponds to the crystal IR absorption edge, as opposed to the residual absorption peak. Density functional theory computations clearly show which the residual absorption on the BGSe crystal orig