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