′�?, by using a frequency of 295 cm−1, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−1 phonon corresponds towards the crystal IR absorption edge, instead of the residual absorption peak. Density practical concept computations exhibit that the residual absorption from the BGSe https://juliushycef.actoblog.com/33434209/about-baga4se7-crystal