J/A+A/543/A139ivo://CDS.VizieR/J/A+A/543/A139doi:10.26093/cds/vizier.35430139CDSDel Zanna G.Storey P.J.Badnell N.R.Mason H.E.2012-09-24T14:32:54Z2012-07-12T07:50:51ZCDS support team

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

cds-question@unistra.fratomic-physicsWe present new large-scale R-matrix (up to n=4) and distorted-wave (DW, up to n=6) scattering calculations for electron collisional excitation of Fe XII. The first aim is to provide accurate atomic data for the soft X-rays, where strong decays from the n=4 levels are present. As found in previous work on Fe X, resonances attached to n=4 levels increase the cross-sections for excitations from the ground state to some n=4 levels, when compared to DW calculations. Cascading from higher levels is also important. We provide a number of models and line intensities, and list a number of strong unidentified lines. The second aim is to assess the effects of the large R-matrix calculation on the n=3 transitions. Compared to our previous (n=3) R-matrix calculation, we find overall excellent agreement to within a few percent, however a few key density diagnostic EUV intensities differ by about 60% at coronal densities. The new atomic data result in lower electron densities, resolving previous discrepancies with solar observations.2012A&A...543A.139Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/543/A139CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/541/A90 : Fe X soft X-ray lines (Del Zanna+, 2012)J/A+A/543/A144 : Fe XIII soft X-ray lines (Del Zanna+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/543/A139https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/543/A139http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/543/A139https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/543/A139https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/543/A139http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/543/A139GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapX-raydefaultJ/A+A/543/A139/table2Transition probabilities and thermally averaged collision strengths for the RM4 calculationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinti[1/912] Upper level index of the transitionmeta.idintj[1/912] Lower level index of the transitionmeta.idintAEinstein A coefficients**-1phys.atmol.transProbdoubleCS1Averaged collision strength at T=1.0x10^4^Kphys.atmol.collStrengthdoubleCS2Averaged collision strength at T=2.51x10^4^Kphys.atmol.collStrengthdoubleCS3Averaged collision strength at T=5.01x10^4^Kphys.atmol.collStrengthdoubleCS4Averaged collision strength at T=1x10^5^Kphys.atmol.collStrengthdoubleCS5Averaged collision strength at T=2x10^5^Kphys.atmol.collStrengthdoubleCS6Averaged collision strength at T=3.16x10^5^Kphys.atmol.collStrengthdoubleCS7Averaged collision strength at T=5.01x10^5^Kphys.atmol.collStrengthdoubleCS8Averaged collision strength at T=7.94x10^5^Kphys.atmol.collStrengthdoubleCS9Averaged collision strength at T=1x10^6^Kphys.atmol.collStrengthdoubleCS10Averaged collision strength at T=1.26x10^6^Kphys.atmol.collStrengthdoubleCS11Averaged collision strength at T=2x10^6^Kphys.atmol.collStrengthdoubleCS12Averaged collision strength at T=3.16x10^6^Kphys.atmol.collStrengthdoubleCS13Averaged collision strength at T=5.01x10^6^Kphys.atmol.collStrengthdoubleCS14Averaged collision strength at T=7.94x10^6^Kphys.atmol.collStrengthdoubleCS15Averaged collision strength at T=1.26x10^7^Kphys.atmol.collStrengthdoubleCS16Averaged collision strength at T=2x10^7^Kphys.atmol.collStrengthdoubleCS17Averaged collision strength at T=3.98x10^7^Kphys.atmol.collStrengthdoubleCS18Averaged collision strength at T=1x10^8^Kphys.atmol.collStrengthdoubleElimHigh-energy limitRyphys.energy;phys.atmol.leveldoubleJ/A+A/543/A139/table3Level energies of the DW6 calculationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIndex[1/5143] Level indexmeta.idintLevelLevel descriptionmeta.note;phys.atmol.levelchar2S+1[2/6] 2S+1 multiplicityphys.atmol.qnintL[SPDFGHIK] L valuephys.atmol.qncharJ[0.5/7.5] J valuephys.atmol.qnfloatETarget energy (ab initio)cm**-1phys.energy;phys.atmol.leveldoubleJ/A+A/543/A139/table4Thermally averaged collision strengths for the DW6 calculationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinti[1/5143] Upper level index of the transitionmeta.idintj[1/41] Lower level index of the transitionmeta.idintAEinstein A coefficients**-1phys.atmol.transProbdoubleCS1Averaged collision strength at T=1.0x10^4^Kphys.atmol.collStrengthdoubleCS2Averaged collision strength at T=2.51x10^4^Kphys.atmol.collStrengthdoubleCS3Averaged collision strength at T=5.01x10^4^Kphys.atmol.collStrengthdoubleCS4Averaged collision strength at T=1x10^5^Kphys.atmol.collStrengthdoubleCS5Averaged collision strength at T=2x10^5^Kphys.atmol.collStrengthdoubleCS6Averaged collision strength at T=3.16x10^5^Kphys.atmol.collStrengthdoubleCS7Averaged collision strength at T=5.01x10^5^Kphys.atmol.collStrengthdoubleCS8Averaged collision strength at T=7.94x10^5^Kphys.atmol.collStrengthdoubleCS9Averaged collision strength at T=1x10^6^Kphys.atmol.collStrengthdoubleCS10Averaged collision strength at T=1.26x10^6^Kphys.atmol.collStrengthdoubleCS11Averaged collision strength at T=2x10^6^Kphys.atmol.collStrengthdoubleCS12Averaged collision strength at T=3.16x10^6^Kphys.atmol.collStrengthdoubleCS13Averaged collision strength at T=5.01x10^6^Kphys.atmol.collStrengthdoubleCS14Averaged collision strength at T=7.94x10^6^Kphys.atmol.collStrengthdoubleCS15Averaged collision strength at T=1.26x10^7^Kphys.atmol.collStrengthdoubleCS16Averaged collision strength at T=2x10^7^Kphys.atmol.collStrengthdoubleCS17Averaged collision strength at T=3.98x10^7^Kphys.atmol.collStrengthdoubleCS18Averaged collision strength at T=1x10^8^Kphys.atmol.collStrengthdoubleElimHigh-energy limitRyphys.energy;phys.atmol.leveldoubleJ/A+A/543/A139/table5Transition probabilities for the DW6 calculation (full dataset)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinti[0/999] Lower level index of the transitionmeta.idintj[1/5143] Upper level index of the transitionmeta.idintloggfOscillator strength (gf value)phys.atmol.oscStrengthdoubleAEinstein A coefficients**-1phys.atmol.transProbdoubleJ/A+A/543/A139/table1Level energies of the RM4 calculationIndex[1/912] Level indexmeta.idintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLevelLevel descriptionmeta.note;phys.atmol.levelchar2S+12S+1 multiplicityphys.atmol.qnintL[0/6] L valuephys.atmol.qnintJ[0.5/7.5] J valuephys.atmol.qnfloatETarget energy (ab initio)cm**-1phys.energy;phys.atmol.leveldouble