′�?, by using a frequency of 295 cm−one, is attributed to the stretching vibration of Ga–Se bonds. The 2-phonon absorption of your 295 cm−1 phonon corresponds to the crystal IR absorption edge, rather than the residual absorption peak. Density useful concept computations show which the residual absorption with the BGSe https://baga4se7crystal39528.aboutyoublog.com/35341072/baga4se7-crystal-an-overview