′�?, using a frequency of 295 cm−1, is attributed towards the stretching vibration of Ga–Se bonds. The 2-phonon absorption from the 295 cm−one phonon corresponds on the crystal IR absorption edge, as an alternative to the residual absorption peak. Density functional theory computations exhibit the residual absorption of the BGSe https://baga4se7-crystal42952.mybloglicious.com/53234767/not-known-facts-about-baga4se7-crystal