′�?, by using a frequency of 295 cm−1, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption on the 295 cm−one phonon corresponds to the crystal IR absorption edge, rather then the residual absorption peak. Density purposeful idea computations exhibit which the residual absorption on the BGSe https://baga4se7-crystal52849.ageeksblog.com/31678557/examine-this-report-on-baga4se7-crystal