′�?, with a frequency of 295 cm−one, is attributed towards the stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−one phonon corresponds to your crystal IR absorption edge, rather then the residual absorption peak. Density useful concept computations show the residual absorption from the BGSe crystal originates https://jeffreyeffea.blogpostie.com/54369916/about-baga4se7-crystal