′�?, with a frequency of 295 cm−one, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption in the 295 cm−one phonon corresponds to your crystal IR absorption edge, in lieu of the residual absorption peak. Density practical principle computations present the residual absorption of your BGSe crystal https://jasperemoop.blogdigy.com/how-much-you-need-to-expect-you-ll-pay-for-a-good-baga4se7-crystal-48911997