′�?, with a frequency of 295 cm−1, is attributed towards the stretching vibration of Ga–Se bonds. The two-phonon absorption of your 295 cm−one phonon corresponds to your crystal IR absorption edge, rather than the residual absorption peak. Density practical principle computations clearly show that the residual absorption with the BGSe https://baga4se7crystal31863.theideasblog.com/33127287/5-easy-facts-about-baga4se7-crystal-described