Resonant satellites in the photoionization of atomic Na

Using many-body perturbation theory, we have the calculation for resonance structure into the main lines and satellite lines in photoionization for neutral sodium. This resonance structure results from the interference between a main line or a satellite line and a resonant Auger process. The coupled equation method has been improved to calculate this interference by the summation of specific classes of diagrams of perturbation theory to infinite order. The theoretical results are in good agreement with experiment.