′�?, by using a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−1 phonon corresponds on the crystal IR absorption edge, rather than the residual absorption peak. Density useful concept computations demonstrate the residual absorption in the BGSe crystal https://baga4se7-crystal95073.bloggazzo.com/31821031/getting-my-baga4se7-crystal-to-work