′�?, which has a frequency of 295 cm−1, is attributed towards the stretching vibration of Ga–Se bonds. The 2-phonon absorption in the 295 cm−1 phonon corresponds to your crystal IR absorption edge, instead of the residual absorption peak. Density functional theory computations show the residual absorption in the BGSe crystal https://malcolmf433uhu7.buyoutblog.com/profile