′�?, having a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption in the 295 cm−1 phonon corresponds to the crystal IR absorption edge, instead of the residual absorption peak. Density functional idea computations present which the residual absorption from the BGSe crystal https://donaldy581dee5.blogdanica.com/32405228/new-step-by-step-map-for-baga4se7-crystal