′�?, which has a frequency of 295 cm−one, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption in the 295 cm−1 phonon corresponds to the crystal IR absorption edge, rather than the residual absorption peak. Density practical idea computations exhibit the residual absorption in the BGSe crystal https://zanetaefh.fitnell.com/73591605/examine-this-report-on-baga4se7-crystal