Issue |
Astron. Astrophys. Suppl. Ser.
Volume 135, Number 1, February II 1999
|
|
---|---|---|
Page(s) | 159 - 169 | |
DOI | https://doi.org/10.1051/aas:1999445 | |
Published online | 15 February 1999 |
Atomic data from the IRON Project*
XXXIII. Radiative rates for the intercombination transitions in the carbon isoelectronic sequence
1
Centro de Física, Instituto Venezolano de Investigaciones Científicas (IVIC), PO Box 21827, Caracas 1020A, Venezuela
2
URA 173 (associée au CNRS et à l'Université Paris 7) et DAEC, Observatoire de Paris, F-92195 Meudon, France
3
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
Send offprint request to: C.J. Zeippen
Received:
11
June
1998
Accepted:
31
August
1998
Radiative decay rates are computed with the atomic structure code
superstructure for the
,
and
intercombination transitions of the
carbon isoelectronic sequence (
). Contributions from
configuration interaction and relativistic corrections are carefully studied,
in particular the spin–spin interaction
that is shown to be of considerable importance for low Z. By extensive
comparisons with other theoretical datasets and measurements of the
radiative lifetime and the
P
P
branching ratio, we are able to assign accuracy ratings to the present
transition probabilities. The transitions to the ground term are believed
to be accurate to better than 10% whereas the smaller A-values belonging
to transitions to the
are not expected to be accurate to
more than 20%.
Key words: atomic data
© European Southern Observatory (ESO), 1999