Atomic data from the IRON Project. XXIX. Radiative rates for transitions within the N = 2 complex in ions of the boron isoelectronic sequence
Abstract
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<= Z<= 28). The computations have been carried out with the atomic structure code superstructure which facilitates the generation of extended 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 this sequence, with detailed single-ion calculations and recent experiments, we have been able to assign accuracy ratings to the present A-values. We find that in general the spin-allowed and spin-forbidden E1 transitions are accurate to 10% and 20%, respectively, except for a few transitions in ions with Z<= 7 that are perturbed by admixture with low-lying n=3 states (e.g. 2ssp23l ) and for those affected by the avoided crossing of the 2s2psp2 \ sp2 S_{1/2} and sp2 P_{1/2} which takes place at Z ~ 22. It is concluded that, statistically, the present dataset is the most accurate to date for this astrophysically relevant sequence. A detailed table of the present transition probabilities is available in electronic form from the CDS via anonymous ftp 130.79.128.5
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- September 1998
- DOI:
- 10.1051/aas:1998435
- Bibcode:
- 1998A&AS..131..499G
- Keywords:
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- ATOMIC DATA;
- ATOMIC PROCESSES