′�?, by using a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption of your 295 cm−1 phonon corresponds for the crystal IR absorption edge, as opposed to the residual absorption peak. Density functional theory computations show the residual absorption from the BGSe https://kylerzcerv.tribunablog.com/top-guidelines-of-baga4se7-crystal-47029317