′�?, by using a frequency of 295 cm−one, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption of your 295 cm−1 phonon corresponds to the crystal IR absorption edge, rather than the residual absorption peak. Density functional idea computations exhibit the residual absorption of your BGSe crystal https://cristiantvtql.dailyhitblog.com/38204125/not-known-facts-about-baga4se7-crystal