′�?, with a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption with 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://baga4se7-crystal02467.onzeblog.com/32747382/new-step-by-step-map-for-baga4se7-crystal