′�?, using a frequency of 295 cm−1, is attributed on the stretching vibration of Ga–Se bonds. The 2-phonon absorption of the 295 cm−1 phonon corresponds towards the crystal IR absorption edge, rather then the residual absorption peak. Density functional principle computations present the residual absorption on the BGSe crystal originates https://baga4s7crystal07272.blue-blogs.com/39776443/top-latest-five-baga4se7-crystal-urban-news