′�?, that has 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 into the crystal IR absorption edge, as opposed to the residual absorption peak. Density practical concept computations exhibit the residual absorption on the BGSe https://baga4se7crystal19630.blogthisbiz.com/39060811/5-easy-facts-about-baga4se7-crystal-described