′�?, using a frequency of 295 cm−1, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption of the 295 cm−one phonon corresponds for the crystal IR absorption edge, in lieu of the residual absorption peak. Density practical theory computations clearly show the residual absorption of the BGSe https://bbocrystal94051.blogrelation.com/38993208/examine-this-report-on-baga4se7-crystal