′�?, that has a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−1 phonon corresponds to the crystal IR absorption edge, instead of the residual absorption peak. Density functional idea computations exhibit the residual absorption with the BGSe crystal https://baga4se7-crystal37147.kylieblog.com/33324998/what-does-baga4se7-crystal-mean