J/A+A/433/731ivo://CDS.VizieR/J/A+A/433/731doi:10.26093/cds/vizier.34330731CDSDel Zanna G.Mason H.E.2005-04-20T12:49:44Z2005-04-20T12:49:15ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fratomic-physicsWe use recently calculated electron collisional data by Storey et al. (2005A&A...433..717S) for Fe XII (n=3 configurations) to build a model ion to compare to spectroscopic observations of the solar corona and laboratory measurements. We review all the line identifications of the brightest lines, by comparing both wavelengths and line intensities. The presence of blends in different plasma conditions is highlighted. A large number of new energy levels and line identifications are proposed. In particular, we identify the electric quadrupole ^4P_5/2_-^4^F_9/2_ transition with the bright coronal line observed at 592.6{AA}, previously unidentified. This line, when observed with the 1242.0, 1349.5 UV forbidden lines, is a good density diagnostic over a large range of electron densities. We also indicate the best spectral lines to be used for density diagnostics or instrument calibration. From various combinations of lines we obtain electron densities that are significantly different from those published in the previous literature. Some examples are provided. The agreement between theory and experimental data in terms of wavelengths, line intensities and level lifetimes is excellent.2005A&A...433..731Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/433/731CatalogResearchIsServedByTAP VizieR generic servicerelated-towww.nist.gov : NIST Home PageJ/A+A/422/731 : Fe X Benchmarking atomic data (Del Zanna+, 2004)J/A+A/430/331 : Fe XXIII Benchmarking atomic data (Chidichimo+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/433/731https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/433/731http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/433/731https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/433/731https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/433/731http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/433/731GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/433/731/table2Fine Structure Energy table with spectroscopic identificationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intIndexEnergy level indexintConfConfiguration and percentage mixingchar2S+1Spin 2S+1intLAngular momentum LcharJTotal angular momentum JcharPParity (odd/even)charEEnergy (best estimate)cm**-1doublee_EUncertainty on Ebcm**-1intE-Enist? Energy difference. Enist: energy as in the NIST database.cm**-1intnullableE-EccEnergy difference. Ecc: energy from the scattering calculationcm**-1intE-EssEnergy difference. Ess: energy from SUPERSTRUCTURE, with term energy correctionscm**-1intJ/A+A/433/731/table3Full set of wavelengths, oscillator strengths (gf), and transition probabilities (A)recnoRecord number assigned by the VizieR team. Should Not be used for identification.intiindex of the lower level (see Table2.dat)intjindex of the upper level (see Table2.dat)intlambdaWavelength calculated from the best energy0.1nmdoublee_lambdaEstimated uncertainty on the wavelength0.1nmdoublegfWeighted oscillator strengthsdoubleATransition probabilitys**-1doubleTransType of transition (1)char