′�?, that has a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption of the 295 cm−one phonon corresponds to the crystal IR absorption edge, rather than the residual absorption peak. Density functional principle computations demonstrate that the residual absorption with the BGSe https://andyhjfcy.ezblogz.com/64408846/rumored-buzz-on-baga4se7-crystal