′�?, having a frequency of 295 cm−1, 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, rather than the residual absorption peak. Density useful principle computations demonstrate which the residual absorption of the BGSe crystal https://baga4se7-crystal82603.idblogz.com/32985700/baga4se7-crystal-an-overview