′�?, using a frequency of 295 cm−one, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption in the 295 cm−one phonon corresponds on the crystal IR absorption edge, as opposed to the residual absorption peak. Density functional theory computations clearly show the residual absorption from the BGSe https://landenzehhd.blogdon.net/top-latest-five-baga4se7-crystal-urban-news-48944537