′�?, with a frequency of 295 cm−1, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−one phonon corresponds to your crystal IR absorption edge, instead of the residual absorption peak. Density practical principle computations present that the residual absorption in the BGSe crystal https://baga4se7-crystal63963.laowaiblog.com/31872301/5-easy-facts-about-baga4se7-crystal-described