′�?, having a frequency of 295 cm−one, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption in the 295 cm−one phonon corresponds for the crystal IR absorption edge, as an alternative to the residual absorption peak. Density functional principle computations demonstrate the residual absorption of the BGSe https://baga4se7crystal30630.acidblog.net/63946174/the-smart-trick-of-baga4se7-crystal-that-nobody-is-discussing