′�?, with a frequency of 295 cm−1, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−one phonon corresponds for the crystal IR absorption edge, rather than the residual absorption peak. Density practical principle computations show that the residual absorption of your BGSe crystal https://andresrspml.aioblogs.com/85850979/baga4se7-crystal-an-overview