RELATIVISTIC EFFECTS IN FEW-ELECTRON HEAVY-IONS - AB-INITIO EVALUATION OF LEVELS ENERGY AND TRANSITIONS PROBABILITIES

Relativistic theory of few-electron heavy ions is outlined. Ions with increasing number of electrons are studied to show the interplay of ma ny-body and relativistic effects. A complete calculation of two-electr on and of the ground configuration of titanium-like ions is reported. The influence of pair creation and correlation on the relativistic M1 transition (1s2s(3)S(1)-->1s(2 1)S(0)) in heliumlike ions is studied. Hyperfine quenching of the J = 4 level of the ground configuration of titanium-like ions is shown to give information on the nuclear electri c quadrupole moment.