′�?, that has a frequency of 295 cm−1, is attributed to your stretching vibration of Ga–Se bonds. The two-phonon absorption of your 295 cm−one phonon corresponds for the crystal IR absorption edge, rather then the residual absorption peak. Density purposeful concept computations demonstrate that the residual absorption in the BGSe https://baga4se7-crystal91346.mybjjblog.com/detailed-notes-on-baga4se7-crystal-45422867