′�?, having a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The 2-phonon absorption from the 295 cm−one phonon corresponds to your crystal IR absorption edge, instead of the residual absorption peak. Density practical concept computations demonstrate which the residual absorption on the BGSe crystal https://trentonbsfsd.blogdigy.com/5-tips-about-baga4se7-crystal-you-can-use-today-48904964