′�?, that has a frequency of 295 cm−one, is attributed to the stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−1 phonon corresponds to the crystal IR absorption edge, rather then the residual absorption peak. Density useful theory computations clearly show the residual absorption on the BGSe https://dantebgkji.kylieblog.com/33260987/everything-about-baga4se7-crystal