′�?, which has a frequency of 295 cm−one, is attributed to your stretching vibration of Ga–Se bonds. The two-phonon absorption in the 295 cm−1 phonon corresponds into the crystal IR absorption edge, rather then the residual absorption peak. Density useful theory computations exhibit the residual absorption on the BGSe crystal https://baga4se7-crystal54186.blogs-service.com/63554658/how-much-you-need-to-expect-you-ll-pay-for-a-good-baga4se7-crystal