Abstract
Various coupling schemes are applied to smaller to heavy atoms to describe atomic structure and investigate atomic spectra. jj-coupling is important for heavy atoms in which spin-orbit interactions are dominant over the electrostatic interactions. Here jj-terms and J levels are determined for the nonequivalent fnfn’ (n & n’ = 1-2) electrons from the analysis of all possible microstates. The determined jj terms are designated of the form notation.