′�?, which has a frequency of 295 cm−1, is attributed to your stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−1 phonon corresponds for the crystal IR absorption edge, as opposed to the residual absorption peak. Density functional idea computations exhibit that the residual absorption in the https://baga4se7crystal73945.ka-blogs.com/86077172/baga4se7-crystal-an-overview