′�?, which has a frequency of 295 cm−one, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−one phonon corresponds for the crystal IR absorption edge, as opposed to the residual absorption peak. Density useful concept computations show the residual absorption in the BGSe https://keikoh037wza3.wikibriefing.com/user