′�?, with a frequency of 295 cm−1, is attributed to the stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−1 phonon corresponds into the crystal IR absorption edge, rather than the residual absorption peak. Density useful principle computations show which the residual absorption on the BGSe crystal https://cesariaozl.snack-blog.com/32728305/a-secret-weapon-for-baga4se7-crystal