A&A Supplement series, Vol. 123, May II 1997, 159-171
Received September 16; accepted September 17, 1996
M.E. Galavís
- C. Mendoza
- C.J.
Zeippen
Send offprint request: C.J. Zeippen
Departamento de Física, Universidad Metropolitana, PO Box
76819, Caracas 1070A, Venezuela - Centro de Física, Instituto
Venezolano de Investigaciones Científicas (IVIC), PO Box 21827, Caracas
1020A, Venezuela
URA 173 (associée au CNRS et à l'Université
Paris 7) et DAEC, Observatoire de Paris, F-92195 Meudon, France
As part of the IRON Project, radiative rates have been calculated for
the forbidden transitions within the ground configuration of atoms and ions in
the carbon (2s
2p
) and oxygen (2s
2p
) isoelectronic
sequences for 
. The atomic structure code
SUPERSTRUCTURE was used, which allows for configuration
interaction, relativistic effects and semi-empirical term energy corrections.
Comparisons are made with previous theoretical datasets for the same sequences.
It is shown once again
that, to obtain reliable transition probabilities, in particular those of the
electric quadrupole type, it is essential to use accurate and consistent
experimental transition wavelengths. For the C and O sequences such data are
fortunately available from the work of Edlén (1983, 1985). The
general accuracy of the present probabilities is rated to be within 10%, with
the exception of some electric quadrupole transitions in low-Z ions whose
radiative rates are small with an accuracy not better than 
%.
keywords: atomic data -- atomic processes