′�?, by using a frequency of 295 cm−one, is attributed for the stretching vibration of Ga–Se bonds. The 2-phonon absorption on the 295 cm−one phonon corresponds to the crystal IR absorption edge, rather than the residual absorption peak. Density functional idea computations present that the residual absorption with the BGSe https://reidiigfs.blogproducer.com/39647084/not-known-details-about-baga4se7-crystal