′�?, that has a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption of the 295 cm−one phonon corresponds to the crystal IR absorption edge, instead of the residual absorption peak. Density purposeful principle computations display which the residual absorption on the BGSe https://baga4se7-crystal97305.blogzag.com/76645219/baga4se7-crystal-an-overview