′�?, using a frequency of 295 cm−1, is attributed on the stretching vibration of Ga–Se bonds. The 2-phonon absorption from the 295 cm−one phonon corresponds on the crystal IR absorption edge, as opposed to the residual absorption peak. Density purposeful principle computations show which the residual absorption in the BGSe https://baga4se7crystal30628.blogzet.com/detailed-notes-on-baga4se7-crystal-47581960