′�?, having a frequency of 295 cm−one, is attributed towards the stretching vibration of Ga–Se bonds. The two-phonon absorption from the 295 cm−1 phonon corresponds into the crystal IR absorption edge, in lieu of the residual absorption peak. Density practical idea computations present the residual absorption from the BGSe crystal https://knoxntxyw.blogacep.com/37877331/how-much-you-need-to-expect-you-ll-pay-for-a-good-baga4se7-crystal