′�?, with a frequency of 295 cm−one, is attributed into 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 display that the residual absorption of your BGSe crystal https://ricardokpoom.pointblog.net/baga4se7-crystal-can-be-fun-for-anyone-75318384