′�?, that has a frequency of 295 cm−one, is attributed for the stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−1 phonon corresponds to the crystal IR absorption edge, rather than the residual absorption peak. Density useful concept computations show the residual absorption from the BGSe crystal https://josueosrok.prublogger.com/31728560/the-smart-trick-of-baga4se7-crystal-that-nobody-is-discussing