′�?, which has a frequency of 295 cm−one, is attributed towards the stretching vibration of Ga–Se bonds. The two-phonon absorption in the 295 cm−1 phonon corresponds into the crystal IR absorption edge, rather then the residual absorption peak. Density useful theory computations show the residual absorption in the BGSe crystal https://baga4se7crystal41840.ttblogs.com/12272399/the-smart-trick-of-baga4se7-crystal-that-no-one-is-discussing