′�?, with a frequency of 295 cm−one, is attributed on the stretching vibration of Ga–Se bonds. The 2-phonon absorption of the 295 cm−1 phonon corresponds for the crystal IR absorption edge, as an alternative to the residual absorption peak. Density useful theory computations present the residual absorption from the BGSe https://carolynr258wyy3.hamachiwiki.com/user