′�?, having a frequency of 295 cm−1, is attributed to the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−one phonon corresponds to the crystal IR absorption edge, instead of the residual absorption peak. Density practical idea computations show that the residual absorption with the BGSe crystal https://baga4se7-crystal62604.vidublog.com/31762919/about-baga4se7-crystal