′�?, using a frequency of 295 cm−one, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−1 phonon corresponds on the crystal IR absorption edge, as opposed to the residual absorption peak. Density purposeful concept computations present the residual absorption in the BGSe crystal https://fernandobjkji.designi1.com/54074295/baga4se7-crystal-options