′�?, with a frequency of 295 cm−1, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption of the 295 cm−one phonon corresponds to your crystal IR absorption edge, rather than the residual absorption peak. Density purposeful concept computations show which the residual absorption in the BGSe crystal https://baga4se7-crystal07417.bloggosite.com/39514762/top-guidelines-of-baga4se7-crystal