′�?, having a frequency of 295 cm−1, is attributed to the stretching vibration of Ga–Se bonds. The 2-phonon absorption of your 295 cm−one phonon corresponds on the crystal IR absorption edge, instead of the residual absorption peak. Density useful principle computations present that the residual absorption of the BGSe crystal https://baga4se7crystal62951.blog-ezine.com/32899557/baga4se7-crystal-an-overview