′�?, by using a frequency of 295 cm−1, is attributed on the stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−1 phonon corresponds towards the crystal IR absorption edge, as an alternative to the residual absorption peak. Density practical concept computations clearly show that the residual absorption https://baga4se7-crystal03456.fitnell.com/73573078/baga4se7-crystal-an-overview