′�?, using 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 into the crystal IR absorption edge, instead of the residual absorption peak. Density purposeful principle computations display which the residual absorption on the BGSe crystal https://baga4se7-crystal91111.ttblogs.com/12391125/baga4se7-crystal-can-be-fun-for-anyone