′�?, by using a frequency of 295 cm−1, is attributed towards the stretching vibration of Ga–Se bonds. The two-phonon absorption of your 295 cm−1 phonon corresponds towards the crystal IR absorption edge, instead of the residual absorption peak. Density purposeful concept computations show the residual absorption from the BGSe crystal https://baga4se7crystal18493.ja-blog.com/32783008/top-guidelines-of-baga4se7-crystal