′�?, using a frequency of 295 cm−1, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption with the 295 cm−1 phonon corresponds to the crystal IR absorption edge, instead of the residual absorption peak. Density functional idea computations clearly show the residual absorption from the BGSe crystal https://connerxqupk.blogchaat.com/32691665/top-guidelines-of-baga4se7-crystal