′�?, 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 practical theory computations clearly show the residual absorption in the BGSe https://andersontjpra.review-blogger.com/54753016/examine-this-report-on-baga4se7-crystal