′�?, by using a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The two-phonon absorption on the 295 cm−one phonon corresponds to your crystal IR absorption edge, instead of the residual absorption peak. Density functional idea computations exhibit the residual absorption from the BGSe crystal https://baga4se7-crystal91345.daneblogger.com/31869978/helping-the-others-realize-the-advantages-of-baga4se7-crystal