′�?, using a frequency of 295 cm−one, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption with the 295 cm−one phonon corresponds into the crystal IR absorption edge, instead of the residual absorption peak. Density functional principle computations present which the residual absorption of your BGSe crystal https://baga4se7crystal18293.blogdosaga.com/32732732/what-does-baga4se7-crystal-mean