′�?, with a frequency of 295 cm−one, is attributed to the stretching vibration of Ga–Se bonds. The two-phonon absorption in the 295 cm−1 phonon corresponds on the crystal IR absorption edge, as opposed to the residual absorption peak. Density functional concept computations clearly show the residual absorption with the BGSe https://vasilievicha222sft7.signalwiki.com/user