′�?, using a frequency of 295 cm−one, is attributed for the stretching vibration of Ga–Se bonds. The 2-phonon absorption from the 295 cm−one phonon corresponds into the crystal IR absorption edge, rather than the residual absorption peak. Density useful theory computations display which the residual absorption from the BGSe crystal https://mylesowxxw.blog-gold.com/41159070/detailed-notes-on-baga4se7-crystal