′�?, having a frequency of 295 cm−1, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption of the 295 cm−1 phonon corresponds on the crystal IR absorption edge, instead of the residual absorption peak. Density purposeful theory computations present which the residual absorption in the BGSe crystal https://waylonqxzbb.theisblog.com/32653907/considerations-to-know-about-baga4se7-crystal