′�?, using a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−one phonon corresponds to your crystal IR absorption edge, in lieu of the residual absorption peak. Density useful concept computations show which the residual absorption with the BGSe https://marioblqxr.ka-blogs.com/85786018/baga4se7-crystal-fundamentals-explained