| Issue |
Astron. Astrophys. Suppl. Ser.
Volume 143, Number 3, May I 2000
|
|
|---|---|---|
| Page(s) | 483 - 489 | |
| DOI | https://doi.org/10.1051/aas:2000336 | |
| Published online | 15 May 2000 | |
Atomic data from the IRON Project*
XLII. Electron impact excitation of Fe xxi
1
Institut für Astronomie und Astrophysik, Scheinerstr. 1, D-81679 München, Germany
2
UMR 8631 (associée au CNRS et à l'Université Paris 7) et DAEC, Observatoire de Paris, F-92195 Meudon, France
Send offprint request to: K. Butler
Received:
20
January
2000
Accepted:
8
February
2000
Collision strengths and collisional rate parameters are provided for
transitions among the 
and 2p
levels of C-like Fe xxi.
The data
have been computed in a 52-state Breit-Pauli approximation thus accounting
for the most prominent relativistic effects. An R-matrix close-coupling
calculation comprising partial wave contributions up to 
and of order
8000 energy points in the range up to 260 Ryd gave cross sections expected
to be accurate to better than 20% for transitions among the levels.
Key words: atomic data / atomic processes
© European Southern Observatory (ESO), 2000