′�?, with a frequency of 295 cm−1, is attributed to your stretching vibration of Ga–Se bonds. The two-phonon absorption of your 295 cm−1 phonon corresponds into the crystal IR absorption edge, rather than the residual absorption peak. Density functional theory computations present the residual absorption in the BGSe crystal originates https://baga4se7-crystal74050.weblogco.com/32759355/baga4se7-crystal-options