′�?, that has a frequency of 295 cm−one, is attributed to your stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−one phonon corresponds on the crystal IR absorption edge, rather then the residual absorption peak. Density purposeful concept computations show the residual absorption from the BGSe crystal https://baga4se7crystal73234.theideasblog.com/33204917/rumored-buzz-on-baga4se7-crystal