Resonance Transition Probabilities for Third-Row Atoms and Ions (Mgi, Siii-iii, Pii, Piv, Sii-iii, Cliii) Including the Important Correlation Effects

A new atomic structure theory, which includes all the important correlation effects, is used to calculate f values for the transitions KL 3sᵃ3pᵇ3dᶜ→KL 3s^a^'3p^b^'3d^c^' in the species Mgi, Siii-iii, Pii, Piv, Sii-iii, and Cliii. Even for the difficult transitions with $f<0.1$, the results we report are in good agreement with experiment, in contrast to the order-of-magnitude errors in previously availabel values. A new type of virtual excitation, from the L shell, is found to contribute 30-60% to such total f values.