′�?, with a frequency of 295 cm−1, is attributed to the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−1 phonon corresponds for the crystal IR absorption edge, in lieu of the residual absorption peak. Density functional idea computations exhibit that the residual absorption in the BGSe https://louisimnki.develop-blog.com/39634916/what-does-baga4se7-crystal-mean