′�?, by using a frequency of 295 cm−one, is attributed on 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 then the residual absorption peak. Density useful concept computations display the residual absorption in the BGSe crystal https://damienumppm.blogzag.com/76548285/detailed-notes-on-baga4se7-crystal