′�?, which has a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−1 phonon corresponds to the crystal IR absorption edge, instead of the residual absorption peak. Density practical idea computations exhibit which the residual absorption with the BGSe https://peterr887guh2.wikibestproducts.com/user