′�?, using a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−1 phonon corresponds towards the crystal IR absorption edge, as opposed to the residual absorption peak. Density functional idea computations show the residual absorption with the BGSe crystal https://baga4se7crystal29528.kylieblog.com/32991405/top-latest-five-baga4se7-crystal-urban-news