′�?, by using a frequency of 295 cm−one, is attributed for the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−1 phonon corresponds for the crystal IR absorption edge, rather then the residual absorption peak. Density useful concept computations display which the residual absorption with the BGSe https://simonjpqrq.blogacep.com/37859806/not-known-details-about-baga4se7-crystal