′�?, that has a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption in the 295 cm−1 phonon corresponds into the crystal IR absorption edge, rather than the residual absorption peak. Density functional concept computations clearly show which the residual absorption in the https://baga4se7crystal79123.onzeblog.com/32797883/baga4se7-crystal-an-overview