′�?, which has a frequency of 295 cm−one, is attributed to the stretching vibration of Ga–Se bonds. The two-phonon absorption of the 295 cm−one phonon corresponds to the crystal IR absorption edge, rather then the residual absorption peak. Density purposeful idea computations demonstrate that the residual absorption with the BGSe https://baga4se7-crystal96295.liberty-blog.com/32572184/baga4se7-crystal-fundamentals-explained