′�?, using a frequency of 295 cm−1, is attributed for the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−one phonon corresponds for the crystal IR absorption edge, as an alternative to the residual absorption peak. Density practical idea computations exhibit the residual absorption on the BGSe https://baga4se7crystal29627.bloginwi.com/66400394/top-guidelines-of-baga4se7-crystal