′�?, that has a frequency of 295 cm−one, is attributed to the stretching vibration of Ga–Se bonds. The two-phonon absorption in the 295 cm−one phonon corresponds on the crystal IR absorption edge, rather then the residual absorption peak. Density practical idea computations exhibit the residual absorption in the BGSe crystal https://baga4se7crystal19628.suomiblog.com/the-ultimate-guide-to-baga4se7-crystal-48430818