′�?, which has a frequency of 295 cm−one, is attributed to your stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−1 phonon corresponds towards the crystal IR absorption edge, instead of the residual absorption peak. Density functional principle computations present that the residual absorption of the BGSe https://andytazyv.activablog.com/31959302/how-much-you-need-to-expect-you-ll-pay-for-a-good-baga4se7-crystal