′�?, with a frequency of 295 cm−one, is attributed to your stretching vibration of Ga–Se bonds. The 2-phonon absorption of your 295 cm−1 phonon corresponds to the crystal IR absorption edge, instead of the residual absorption peak. Density useful principle computations present which the residual absorption with the BGSe crystal https://ferdinandq258yyy3.wikiexpression.com/user