′�?, by using a frequency of 295 cm−one, is attributed to your stretching vibration of Ga–Se bonds. The two-phonon absorption in the 295 cm−1 phonon corresponds to the crystal IR absorption edge, in lieu of the residual absorption peak. Density purposeful principle computations demonstrate the residual absorption from the BGSe https://baga4se7crystal20767.shotblogs.com/baga4se7-crystal-options-46724088