′�?, with a frequency of 295 cm−one, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption in the 295 cm−1 phonon corresponds into the crystal IR absorption edge, as opposed to the residual absorption peak. Density functional principle computations present which the residual absorption in the BGSe https://bonding-laser-crystal80234.tkzblog.com/32643982/5-easy-facts-about-baga4se7-crystal-described