′�?, by using a frequency of 295 cm−1, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−one phonon corresponds towards the crystal IR absorption edge, instead of the residual absorption peak. Density purposeful idea computations demonstrate that the residual absorption with the BGSe https://baga4se7-crystal72356.59bloggers.com/33212643/about-baga4se7-crystal