′�?, which has a frequency of 295 cm−one, is attributed to the stretching vibration of Ga–Se bonds. The two-phonon absorption of the 295 cm−one phonon corresponds to your crystal IR absorption edge, rather then the residual absorption peak. Density purposeful principle computations demonstrate the residual absorption with the BGSe crystal https://augustmxezs.yomoblog.com/39134585/5-tips-about-baga4se7-crystal-you-can-use-today