′�?, using a frequency of 295 cm−1, is attributed to your 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 principle computations display which the residual absorption on the BGSe crystal https://baga4se7-crystal43963.csublogs.com/39436460/the-smart-trick-of-baga4se7-crystal-that-nobody-is-discussing