′�?, having a frequency of 295 cm−one, is attributed to your stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−1 phonon corresponds for the crystal IR absorption edge, as opposed to the residual absorption peak. Density practical concept computations present that the residual absorption with the BGSe https://andersonxcxrn.laowaiblog.com/31853568/what-does-baga4se7-crystal-mean