′�?, which has a frequency of 295 cm−1, is attributed towards the stretching vibration of Ga–Se bonds. The two-phonon absorption of the 295 cm−one phonon corresponds to the crystal IR absorption edge, in lieu of the residual absorption peak. Density useful concept computations show the residual absorption from the BGSe https://baga4se7-crystal03467.educationalimpactblog.com/54585452/baga4se7-crystal-fundamentals-explained