′�?, by using a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−one phonon corresponds on the crystal IR absorption edge, instead of the residual absorption peak. Density useful concept computations show the residual absorption from the BGSe crystal https://andresckmml.canariblogs.com/5-tips-about-baga4se7-crystal-you-can-use-today-47791719