′�?, by using a frequency of 295 cm−one, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−1 phonon corresponds into the crystal IR absorption edge, rather then the residual absorption peak. Density functional idea computations clearly show which the residual absorption of the https://devinduhtf.diowebhost.com/87751070/baga4se7-crystal-fundamentals-explained