′�?, that has a frequency of 295 cm−one, is attributed towards the stretching vibration of Ga–Se bonds. The two-phonon absorption of the 295 cm−one phonon corresponds to your crystal IR absorption edge, as opposed to the residual absorption peak. Density useful concept computations show the residual absorption of your BGSe https://holdengxlwj.thenerdsblog.com/38508460/baga4se7-crystal-fundamentals-explained