′�?, that has a frequency of 295 cm−one, is attributed to your stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−one phonon corresponds for the crystal IR absorption edge, rather then the residual absorption peak. Density useful idea computations present that the residual absorption of your BGSe https://archersjvht.dm-blog.com/32771186/detailed-notes-on-baga4se7-crystal