′�?, using a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption in the 295 cm−1 phonon corresponds to the crystal IR absorption edge, instead of the residual absorption peak. Density functional idea computations exhibit that the residual absorption of your BGSe crystal https://rowanoerco.blogacep.com/38022996/baga4se7-crystal-an-overview