′�?, which has a frequency of 295 cm−1, is attributed towards the 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 idea computations exhibit which the residual absorption from the BGSe https://augustevjvg.nizarblog.com/32967230/how-much-you-need-to-expect-you-ll-pay-for-a-good-baga4se7-crystal