′�?, with a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The 2-phonon absorption of the 295 cm−one phonon corresponds to your crystal IR absorption edge, rather then the residual absorption peak. Density purposeful principle computations present that the residual absorption with the BGSe crystal https://baga4se7-crystal02356.qowap.com/92061199/getting-my-baga4se7-crystal-to-work