Determination of theoretical transition probabilities for the PBIII spectrum

Theoretical values of absolute transition probabilities for 54 lines arisin g from the 6s np configuration of Pb III have been obtained. These values w ere obtained in intermediate coupling (IC) and using ab initio relativistic Hartree-Foch calculations. We used for the IC calculations the standard me thod of least square fitting of experimental energy levels by means of comp uter codes from Cowan. These values, although in general agreement with the rare experimental data, do present some noticeable discrepancies. Analysis of the interaction between D-1(2) levels of 6p(2) and 6s6d configurations shows a 40% contribution from the 6s6p(2) configuration for the lowest one, and a 27% contribution from 6s6d for 6s6p(2).