ATOMIC DATA FROM THE IRON PROJECT - XXIX - RADIATIVE RATES FOR TRANSITIONS WITHIN THE N=2 COMPLEX IN IONS OF THE BORON ISOELECTRONIC SEQUENCE

As part of the IRON Project, radiative rates have been calculated for the E1, E2 and M1 transitions within the n = 2 complex in ions of the boron isoelectronic sequence (6 less than or equal to Z less than or e qual to 28). The computations have been carried out with the atomic st ructure code SUPERSTRUCTURE which facilitates the generation of extend ed radiative datasets including configuration interaction, Breit-Pauli relativistic contributions and semi-empirical term-energy corrections . By means of extensive comparisons with the available datasets for th is sequence! with detailed single-ion calculations and recent experime nts, ive have been able to assign accuracy ratings to the present A-va lues. We find that in general the spin-allowed and spin-forbidden E1 t ransitions are accurate to 10% and 20%, respectively, except for a few transitions in ions with Z less than or equal to 7 that are perturbed by admixture with low-lying n = 3 states (e.g. 2s(2)3l) and for those affected by the avoided crossing of the 2s2p(2) S-2(1/2) and P-2(1/2) which takes place at Z similar to 22. It is concluded that, statistic ally, the present dataset is the most accurate to date for this astrop hysically relevant sequence.