′�?, that has a frequency of 295 cm−one, is attributed to the stretching vibration of Ga–Se bonds. The 2-phonon absorption from the 295 cm−one phonon corresponds on the crystal IR absorption edge, rather then the residual absorption peak. Density functional idea computations exhibit the residual absorption in the BGSe crystal https://aggas2crystal53840.blogpayz.com/32704844/5-tips-about-baga4se7-crystal-you-can-use-today