′�?, using a frequency of 295 cm−one, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption of your 295 cm−1 phonon corresponds to the crystal IR absorption edge, instead of the residual absorption peak. Density functional idea computations clearly show that the residual absorption on the BGSe https://baga4se7-crystal03457.blog5star.com/33268149/what-does-baga4se7-crystal-mean