′�?, with a frequency of 295 cm−1, is attributed to your stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−1 phonon corresponds towards the crystal IR absorption edge, in lieu of the residual absorption peak. Density useful principle computations demonstrate the residual absorption of the BGSe crystal https://margaretv009odr6.scrappingwiki.com/user