′�?, with a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption with the 295 cm−1 phonon corresponds for the crystal IR absorption edge, as opposed to the residual absorption peak. Density functional principle computations display which the residual absorption on the BGSe https://cruzudfig.free-blogz.com/80113118/5-tips-about-baga4se7-crystal-you-can-use-today