′�?, with a frequency of 295 cm−1, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption of the 295 cm−1 phonon corresponds on the crystal IR absorption edge, instead of the residual absorption peak. Density useful theory computations exhibit that the residual absorption of the BGSe crystal https://louisimnki.develop-blog.com/39634916/what-does-baga4se7-crystal-mean