′�?, having a frequency of 295 cm−1, is attributed into the stretching vibration of Ga–Se bonds. The two-phonon absorption on the 295 cm−one phonon corresponds on the crystal IR absorption edge, in lieu of the residual absorption peak. Density purposeful principle computations demonstrate that the residual absorption of the BGSe https://rowandghge.fare-blog.com/32779566/baga4se7-crystal-an-overview