′�?, having a frequency of 295 cm−1, is attributed to the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−1 phonon corresponds into the crystal IR absorption edge, rather then the residual absorption peak. Density useful theory computations clearly show that the residual absorption in the BGSe https://baga4se7-crystal40593.blog-ezine.com/32575996/not-known-facts-about-baga4se7-crystal