Astron. Astrophys. Suppl. Ser. 131, 499-522
M.E. Galavís1,2,3 - C. Mendoza2,3 - C.J. Zeippen3
Send offprint request: C.J. Zeippen
1 - Departamento de Física, Universidad Metropolitana, PO Box
76819, Caracas 1070A, Venezuela
2 - Centro de Física, Instituto
Venezolano de Investigaciones Científicas (IVIC), PO Box 21827, Caracas
1020A, Venezuela
3 - URA 173 (associée au CNRS et à l'Université
Paris 7) et DAEC, Observatoire de Paris, F-92195 Meudon, France
Received December 30, 1997; accepted March 18, 1998
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 (). 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
that are perturbed by admixture with low-lying
n=3 states (e.g. 2s
)and for those affected by the avoided crossing of the
2s2p
S1/2 and
P1/2 which takes
place at
. It is concluded that, statistically, the present dataset
is the most
accurate to date for this astrophysically relevant sequence.
Key words: atomic data -- atomic processes
Copyright The European Southern Observatory (ESO)