′�?, by using a frequency of 295 cm−one, is attributed to the stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−1 phonon corresponds to the crystal IR absorption edge, rather than the residual absorption peak. Density purposeful principle computations present that the residual absorption with the BGSe https://daltonossqm.designi1.com/54102688/everything-about-baga4se7-crystal