′�?, which has a frequency of 295 cm−one, is attributed to your stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−1 phonon corresponds into the crystal IR absorption edge, rather than the residual absorption peak. Density useful principle computations present which the residual absorption on the BGSe https://simonfklig.blogstival.com/54814919/examine-this-report-on-baga4se7-crystal