′�?, with a frequency of 295 cm−1, is attributed to the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−1 phonon corresponds to the crystal IR absorption edge, rather than the residual absorption peak. Density useful concept computations show that the residual absorption in the BGSe crystal https://josephb568tqk6.buscawiki.com/user