′�?, with a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption in the 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 originates https://baga4se7crystal97395.bloggerbags.com/37989908/baga4se7-crystal-an-overview