′�?, by using a frequency of 295 cm−one, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption in the 295 cm−1 phonon corresponds towards the crystal IR absorption edge, rather then the residual absorption peak. Density useful concept computations demonstrate that the residual absorption on the BGSe https://baga4se7-crystal51730.blog-mall.com/33389747/baga4se7-crystal-an-overview