′�?, with a frequency of 295 cm−one, is attributed to the stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−1 phonon corresponds for the crystal IR absorption edge, as opposed to the residual absorption peak. Density useful concept computations demonstrate the residual absorption on the BGSe crystal https://andresrspml.aioblogs.com/85850979/baga4se7-crystal-an-overview