′�?, with a frequency of 295 cm−1, is attributed on the stretching vibration of Ga–Se bonds. The two-phonon absorption in the 295 cm−1 phonon corresponds to the crystal IR absorption edge, in lieu of the residual absorption peak. Density purposeful theory computations display which the residual absorption in the BGSe https://baga4se7crystal07305.targetblogs.com/33153879/5-simple-techniques-for-baga4se7-crystal