′�?, using a frequency of 295 cm−1, is attributed to your stretching vibration of Ga–Se bonds. The 2-phonon absorption in the 295 cm−one phonon corresponds for the crystal IR absorption edge, instead of the residual absorption peak. Density practical idea computations demonstrate that the residual absorption with the BGSe crystal https://baga4se7-crystal86307.digitollblog.com/32590287/5-simple-techniques-for-baga4se7-crystal