′�?, having a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption with the 295 cm−one phonon corresponds on the crystal IR absorption edge, as an alternative to the residual absorption peak. Density functional theory computations show the residual absorption from the BGSe https://baga4se7-crystal95184.idblogmaker.com/31995778/rumored-buzz-on-baga4se7-crystal