Correlation and Relativistic Effects on Lande gJ Factors of Atomic Ions

We investigate relativistic effects on the Lande gJ factors of atomic ions using Multiconfiguration Dirac-Fock technique and Relativistic Many-Body perturbation theory. The role of Breit interaction, negative energy continuum and correlation effects is studied in Li-like, B-like, N-like ions and Ca+ ground-states. We also investigate Ti-like ions which have a long-lived excited state with J=4. Those ions are all good candidates for employing the continuous Stern-Gerlach effect to measure their gJ-factor and provide accurate tests of relativistic many-body calculations.