Volume 549, January 2013
|Number of page(s)||9|
|Section||Atomic, molecular, and nuclear data|
|Published online||13 December 2012|
Atomic data for astrophysics: Fe xi soft X-ray lines⋆
1 DAMTP, Centre for Mathematical Sciences, Wilberforce Road, Cambridge, CB3 0WA, UK
2 Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK
Received: 18 June 2012
Accepted: 16 November 2012
We present new large-scale R-matrix (up to n = 4) and distorted wave (up to n = 6) scattering calculations for electron collisional excitation of Fe xi. These data are needed for the analysis of soft X-ray spectra of astrophysical plasmas, where strong n = 4 → n = 3 transitions are present. As found in previous work on Fe x, Fe xii, and Fe xiii, resonances from within the n = 4 levels and cascading from higher levels significantly increase the intensities of these lines. We provide a list of the strongest lines, many of which are unidentified. The present larger model produces intensities for decays from n = 3 levels mostly consistent with our previous work, however significant enhancements for some lower levels are found, in particular for the 3s2 3p3 3d 5D which can be used to measure electron temperatures in the solar corona with the Hinode/EIS spectrometer.
Key words: atomic data / Sun: corona / line: identification / techniques: spectroscopic
The full dataset is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (184.108.40.206) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/549/A42
© ESO, 2012
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