′�?, having a frequency of 295 cm−one, is attributed towards the stretching vibration of Ga–Se bonds. The two-phonon absorption of the 295 cm−1 phonon corresponds for the crystal IR absorption edge, in lieu of the residual absorption peak. Density useful principle computations exhibit the residual absorption from the BGSe crystal https://marioblqxr.ka-blogs.com/85786018/baga4se7-crystal-fundamentals-explained