′�?, with a frequency of 295 cm−1, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−one phonon corresponds for the crystal IR absorption edge, as opposed to the residual absorption peak. Density functional concept computations clearly show which the residual absorption in the https://baga4se7-crystal25689.popup-blog.com/31922979/baga4se7-crystal-an-overview