J/A+A/433/717 IRON Project. LVIII. (Storey+, 2005)
Atomic data from the IRON Project. LVIII. Electron impact excitation of FeXII.
Storey P.J., Del Zanna G., Mason H.E., Zeippen C.J.
<Astron. Astrophys., 433, 717-730 (2005)>
=2005A&A...433..717S 2005A&A...433..717S (SIMBAD/NED BibCode)
ADC_Keywords:
Keywords: atomic data - Sun: corona - techniques: spectroscopic
Abstract:
A new calculation of rate coefficients for electron collisional
excitation of Fe XII 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 Fe XII now indicate electron densities close to those derived from
other ions of comparable ionization potential.
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Author's address:
P.J. Storey,
(End) Patricia Vannier [CDS] 10-Feb-2010