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Atomic data from the IRON project - LVIII. Electron impact excitation of Fe XII

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. Green open access

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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.ucl.ac.uk/id/eprint/10064
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