′�?, with a frequency of 295 cm−one, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption with the 295 cm−1 phonon corresponds on the crystal IR absorption edge, as opposed to the residual absorption peak. Density purposeful theory computations exhibit that the residual absorption on the BGSe https://baga4se7-crystal91346.widblog.com/87765774/top-guidelines-of-baga4se7-crystal