′�?, by using a frequency of 295 cm−1, is attributed to your stretching vibration of Ga–Se bonds. The 2-phonon absorption of your 295 cm−1 phonon corresponds towards the crystal IR absorption edge, instead of the residual absorption peak. Density purposeful principle computations display which the residual absorption in the BGSe https://baga4se7crystal94825.blogacep.com/38007176/5-easy-facts-about-baga4se7-crystal-described