′�?, by using a frequency of 295 cm−1, is attributed to your stretching vibration of Ga–Se bonds. The two-phonon absorption in the 295 cm−1 phonon corresponds into the crystal IR absorption edge, rather than the residual absorption peak. Density practical principle computations present the residual absorption of the BGSe crystal https://stephenkopon.myparisblog.com/33189986/considerations-to-know-about-baga4se7-crystal