′�?, having a frequency of 295 cm−one, is attributed to the stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−one phonon corresponds towards the crystal IR absorption edge, as opposed to the residual absorption peak. Density functional idea computations exhibit the residual absorption from the BGSe crystal https://waylontswrj.bloguetechno.com/baga4se7-crystal-fundamentals-explained-67821469