′�?, with a frequency of 295 cm−one, is attributed for the stretching vibration of Ga–Se bonds. The 2-phonon absorption of your 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 of the BGSe crystal originates https://bonding-laser-crystal24678.blogoscience.com/38932506/baga4se7-crystal-an-overview