′�?, by using a frequency of 295 cm−one, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption of the 295 cm−one phonon corresponds for the crystal IR absorption edge, in lieu of the residual absorption peak. Density practical principle computations exhibit the residual absorption from the BGSe https://baga4se7crystal97406.look4blog.com/70991320/baga4se7-crystal-an-overview