′�?, which has a frequency of 295 cm−one, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−one phonon corresponds into the crystal IR absorption edge, instead of the residual absorption peak. Density purposeful principle computations display that the residual absorption from the BGSe https://beckettgjjge.blogoxo.com/32797853/not-known-factual-statements-about-baga4se7-crystal