′�?, having a frequency of 295 cm−1, is attributed to the stretching vibration of Ga–Se bonds. The two-phonon absorption of the 295 cm−one phonon corresponds to your crystal IR absorption edge, in lieu of the residual absorption peak. Density useful concept computations display the residual absorption from the BGSe crystal https://baga4se7-crystal13578.blogacep.com/37994999/the-smart-trick-of-baga4se7-crystal-that-no-one-is-discussing