Issue |
Astron. Astrophys. Suppl. Ser.
Volume 131, Number 3, September 1998
|
|
---|---|---|
Page(s) | 499 - 522 | |
DOI | https://doi.org/10.1051/aas:1998435 | |
Published online | 15 September 1998 |
Atomic data from the IRON Project*
XXIX. Radiative rates for transitions within the n = 2 complex in ions of the boron isoelectronic sequence
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
Send offprint request to: C.J. Zeippen
Received:
30
December
1997
Accepted:
18
March
1998
As part of the IRON Project, radiative rates have been calculated for
the E1, E2 and M1 transitions within the 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
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
© European Southern Observatory (ESO), 1998