′�?, using 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, rather than the residual absorption peak. Density purposeful concept computations demonstrate that the residual absorption of the BGSe crystal https://baga4se7crystal53851.canariblogs.com/about-baga4se7-crystal-47487751