′�?, with 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, in lieu of the residual absorption peak. Density useful theory computations clearly show the residual absorption of the BGSe https://cesarspmey.blog2freedom.com/32647577/5-simple-techniques-for-baga4se7-crystal