′�?, that has a frequency of 295 cm−1, is attributed to the stretching vibration of Ga–Se bonds. The two-phonon absorption of your 295 cm−1 phonon corresponds on the crystal IR absorption edge, instead of the residual absorption peak. Density functional principle computations present which the residual absorption in the BGSe https://baga4se7-crystal16161.blazingblog.com/32849199/top-latest-five-baga4se7-crystal-urban-news