′�?, having a frequency of 295 cm−one, is attributed to your stretching vibration of Ga–Se bonds. The 2-phonon absorption of the 295 cm−1 phonon corresponds towards the crystal IR absorption edge, instead of the residual absorption peak. Density purposeful principle computations display which the residual absorption in the BGSe crystal https://baga4se7-crystal75184.popup-blog.com/31698887/baga4se7-crystal-options