′�?, that has a frequency of 295 cm−one, is attributed into the stretching vibration of Ga–Se bonds. The two-phonon absorption with the 295 cm−one phonon corresponds into the crystal IR absorption edge, rather then the residual absorption peak. Density purposeful principle computations demonstrate the residual absorption on the BGSe crystal https://baga4se7crystal35790.smblogsites.com/32809873/the-smart-trick-of-baga4se7-crystal-that-nobody-is-discussing