′�?, having a frequency of 295 cm−1, is attributed to the stretching vibration of Ga–Se bonds. The two-phonon absorption with the 295 cm−one phonon corresponds into the crystal IR absorption edge, instead of the residual absorption peak. Density practical concept computations show which the residual absorption in the BGSe crystal https://franciscofvhuf.bloggactif.com/33940508/the-smart-trick-of-baga4se7-crystal-that-nobody-is-discussing