′�?, by using a frequency of 295 cm−1, is attributed to your stretching vibration of Ga–Se bonds. The 2-phonon absorption in the 295 cm−1 phonon corresponds on the crystal IR absorption edge, rather than the residual absorption peak. Density useful idea computations present which the residual absorption on the BGSe https://baga4se7-crystal64062.mybjjblog.com/about-baga4se7-crystal-45652011