Systematic calculations of correlation in complex ions

Systematic calculations of atomic properties, using the Multiconfiguration and Configuration Interaction techniques, are discussed. Different quality criteria for atomic structure calculations are pointed out, and examples are given to illustrate these points. Among the properties discussed are oscillator strengths for resonance lines, magnetic dipole hyperfine structure constants, lifetimes of metastable states, transition probabilities of intercombination lines, and level structure of rare earth elements. New results are presented for the 3 s 2 3 p 2 3 P J – 3 s 3 p 3 5 S 2 transitions in silicon-like systems.