′�?, having 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 on the crystal IR absorption edge, as opposed to the residual absorption peak. Density functional idea computations demonstrate that the residual absorption from the BGSe https://robertu480aee4.wikiexcerpt.com/user