′�?, which has a frequency of 295 cm−one, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption in the 295 cm−one phonon corresponds towards the crystal IR absorption edge, instead of the residual absorption peak. Density purposeful principle computations display the residual absorption from the BGSe crystal https://baga4se7crystal16049.blazingblog.com/32778034/baga4se7-crystal-options