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

Abstract

A new atomic structure theory, which includes all the important correlation effects, is used to calculate $f$ values for the transitions $\mathrm{KL} 3{s}^{a}3{p}^{b}3{d}^{c}\ensuremath{\rightarrow}\mathrm{KL} 3{s}^{{a}^{\ensuremath{'}}}3{p}^{{b}^{\ensuremath{'}}}3{d}^{{c}^{\ensuremath{'}}}$ 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.