′�?, 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 to the crystal IR absorption edge, in lieu of the residual absorption peak. Density functional idea computations present that the residual absorption from the BGSe https://baga4se7crystal73836.yomoblog.com/39217856/examine-this-report-on-baga4se7-crystal