′�?, that has a frequency of 295 cm−1, is attributed to your stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−1 phonon corresponds to the crystal IR absorption edge, rather than the residual absorption peak. Density purposeful principle computations present that the residual absorption of your BGSe https://gregorytcbik.blogspothub.com/31683802/detailed-notes-on-baga4se7-crystal