| Issue |
A&A
Volume 372, Number 3, June IV 2001
|
|
|---|---|---|
| Page(s) | 1083 - 1087 | |
| Section | Catalogs and data | |
| DOI | https://doi.org/10.1051/0004-6361:20010562 | |
| Published online | 15 June 2001 | |
Atomic data from the IRON Project*
L. Electron impact excitation of Fe xix
1
Institut für Astronomie und Astrophysik, Scheinerstr. 1, 81679 München, Germany
2
UMR 8631 (associée au CNRS et à l'Université Paris 7) et DAEC, Observatoire de Paris, 92195 Meudon, France
Corresponding author: K. Butler, butler@usm.uni.muenchen.de
Received:
2
February
2001
Accepted:
11
April
2001
Collision strengths and collisional rate parameters have been calculated for
transitions among 92 
and 
levels of O-like Fe xix. The method used is
the Breit-Pauli R-matrix formalism in which most prominent relativistic effects
are accounted for. Partial wave contributions up to 
are included
explicitly while "top-up" procedures complete the sum to infinity. Several
thousand energy points were used to fully incorporate the effect of resonances
in the collisional cross sections when estimating the collisional rate
parameters. This is particularly important at lower temperatures
where the resonant contributions dominate. The present results are
expected to be accurate to better than 20% for transitions among levels.
Key words: atomic and molecular data
© ESO, 2001
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