Issue |
A&A
Volume 433, Number 2, April II 2005
|
|
---|---|---|
Page(s) | 717 - 730 | |
Section | Atomic, molecular, and nuclear data | |
DOI | https://doi.org/10.1051/0004-6361:20041771 | |
Published online | 22 March 2005 |
Atomic data from the IRON Project*
LVIII. Electron impact excitation of
1
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK e-mail: PJS@star.ucl.ac.uk
2
Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, Wilberforce Road, Cambridge CB3 0WA, UK
3
UMR 8102 (associée au CNRS et à l'Université Paris 7) et LUTH, Observatoire de Paris, 92195 Meudon, France
Received:
2
August
2004
Accepted:
1
November
2004
A new calculation of rate coefficients for electron
collisional excitation of is presented and compared to
earlier calculations. Significant differences are found with all
earlier work due to the inclusion of resonance processes that have not
previously been considered and to the use of the intermediate coupling
frame transformation method. The resulting dataset of collision
strengths
is shown to resolve many of the
outstanding discrepancies between theory and solar observations. In
particular, density sensitive line ratios in
now
indicate electron densities close to those derived from other ions
of comparable ionization potential.
Key words: atomic data / Sun: corona / techniques: spectroscopic
© ESO, 2005
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