Interpretation of the spectrum of Pb(II). Theoretical transition probabilities and lifetimes

Radiative transition probabilities for 190 lines arising from the ns S-2(1/ 2), np P-2(1/2,3/2), nd D-2(3/2,5/2), nf F-2(5/2,7/2), and 6p(2) (P-4(1/2,3 /2,5/2), D-2(3/2,5/2), P-2(1/2,3/2), and S-2(1/2)) levels of Pb(II) have be en calculated. Lifetimes of the above mentioned levels have been determined from the present transition probabilities. These values were obtained in i ntermediate coupling (IC) and using ab initio relativistic Hartree-Fock cal culations. For the IC calculations, we use the standard method of least-squ are fitting of experimental energy levels by means of computer codes from C owan. The results of calculations for radiative transition probabilities an d excited states lifetimes are presented and compared with the experimental results present in the literature and with other theoretical values. There is generally good agreement between our values and the experimental data a vailable. Analysis of the interaction shows that the level P-4(5/2) of the 6s6p(2) configuration presents a large contribution to the D-2(5/2) level o f the 6s(2)6d configuration. This result explains the good agreement betwee n our result and the experimental values obtained to the observed as the 6s 6p(2 4)P(5/2) - 6s (2)5f(2)F(7/2) dipole-forbidden transition.