′�?, which has a frequency of 295 cm−one, is attributed towards the stretching vibration of Ga–Se bonds. The two-phonon absorption of the 295 cm−one phonon corresponds on the crystal IR absorption edge, as an alternative to the residual absorption peak. Density functional theory computations clearly show that the residual absorption https://baga4se7-crystal97496.total-blog.com/about-baga4se7-crystal-58047302