′�?, with a frequency of 295 cm−1, is attributed towards the stretching vibration of Ga–Se bonds. The two-phonon absorption of your 295 cm−one phonon corresponds towards the crystal IR absorption edge, instead of the residual absorption peak. Density purposeful concept computations display which the residual absorption on the BGSe crystal https://erickzaqya.bcbloggers.com/32026186/everything-about-baga4se7-crystal