′�?, using a frequency of 295 cm−1, is attributed to your stretching vibration of Ga–Se bonds. The 2-phonon absorption from the 295 cm−one phonon corresponds on the crystal IR absorption edge, rather than the residual absorption peak. Density useful concept computations clearly show the residual absorption from the BGSe crystal https://baga4se7crystal68013.slypage.com/33210932/baga4se7-crystal-can-be-fun-for-anyone