′�?, having a frequency of 295 cm−1, is attributed into the stretching vibration of Ga–Se bonds. The 2-phonon absorption with the 295 cm−1 phonon corresponds for the crystal IR absorption edge, as an alternative to the residual absorption peak. Density practical idea computations exhibit the residual absorption with the BGSe https://baga4se7-crystal74342.snack-blog.com/32668771/what-does-baga4se7-crystal-mean