Storey, PJ;
Del Zanna, G;
Mason, HE;
Zeippen, CJ;
(2005)
Atomic data from the IRON project - LVIII. Electron impact excitation of Fe XII.
ASTRON ASTROPHYS
, 433
(2)
717 - 730.
10.1051/0004-6361:20041771.
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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.
| Type: | Article |
|---|---|
| Title: | Atomic data from the IRON project - LVIII. Electron impact excitation of Fe XII |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361:20041771 |
| Keywords: | atomic data, Sun : corona, techniques : spectroscopic, EXTREME-ULTRAVIOLET SPECTRUM, FINE-STRUCTURE TRANSITIONS, LINE INTENSITY RATIOS, SOLAR ACTIVE-REGION, GROUND CONFIGURATION, CROSS-SECTIONS, IDENTIFICATIONS, ASTROPHYSICS, SERTS-95, CORONA |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10064 |
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