′�?, with a frequency of 295 cm−1, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption on the 295 cm−1 phonon corresponds into the crystal IR absorption edge, instead of the residual absorption peak. Density useful principle computations demonstrate that the residual absorption of your BGSe crystal https://remingtonzopqb.blogaritma.com/31184105/new-step-by-step-map-for-baga4se7-crystal