′�?, with a frequency of 295 cm−one, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption of the 295 cm−one phonon corresponds on the crystal IR absorption edge, as opposed to the residual absorption peak. Density functional principle computations present which the residual absorption on the BGSe https://franciscochjlk.bloggazzo.com/31887029/baga4se7-crystal-an-overview