′�?, that has a frequency of 295 cm−one, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption of the 295 cm−one phonon corresponds to the crystal IR absorption edge, rather then the residual absorption peak. Density purposeful idea computations present the residual absorption in the BGSe crystal https://baga4s7-crystal02457.luwebs.com/33437547/how-much-you-need-to-expect-you-ll-pay-for-a-good-baga4se7-crystal