′�?, with a frequency of 295 cm−1, is attributed towards the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−1 phonon corresponds to the crystal IR absorption edge, as opposed to the residual absorption peak. Density useful idea computations demonstrate the residual absorption from the BGSe crystal https://marioaxqja.techionblog.com/32747930/5-tips-about-baga4se7-crystal-you-can-use-today