′�?, using a frequency of 295 cm−1, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−one phonon corresponds for the crystal IR absorption edge, as opposed to the residual absorption peak. Density functional theory computations show that the residual absorption of the BGSe https://baga4se7-crystal83813.develop-blog.com/39531826/details-fiction-and-baga4se7-crystal