J/ApJ/812/174ivo://CDS.VizieR/J/ApJ/812/174doi:10.26093/cds/vizier.18120174CDSTayal S.S.Zatsarinny O.2017-01-23T22:00:00Z2016-03-07T13:52:19ZCDS support team

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

cds-question@unistra.fratomic-physicsastronomical-modelsCollision strengths and thermally averaged collision strengths for a large number of extreme-ultraviolet lines of FeIX arising by electron impact have been reported. The thermally averaged collision strengths are calculated at electron temperatures in the range 10^4^-10^7^K for the 122043 forbidden and allowed transitions between the 370 fine-structure levels. The atomic parameters for FeIX play an important role in modeling of various astrophysical plasmas, including especially the solar corona. The B-spline Breit-Pauli R-matrix method has been used in the calculation of collision strengths. The target wave functions and transition probabilities have been determined by combining the multiconfiguration Hartree-Fock method with the B-spline box-based multichannel expansions. We have included 370 fine-structure levels of FeIX in the energy region up to 3s^2^3p^5^5s states. The close-coupling expansion includes levels of the 3s^2^3p^6^, 3s^2^3p^5^3d, 4l, 5s, 3s3p^6^3d, 4s, 4p, 3s^2^3p^4^3d^2^, 3s3p^5^3d^2^ configurations and some low-lying levels of the 3s^2^3p^3^3d^3^ configuration in our collision strengths and transition probabilities calculations. There is a good agreement with the previous R-matrix collision strength calculations by Storey et al. (2002, J/A+A/394/753) and Del Zanna et al. (2014, J/A+A/565/A77) for transitions between the lowest 17 levels of the 3s^2^3p^6^, 3s^2^3p^5^3d and 3s3p^6^3d configurations, especially for electron temperatures logT(K)>=5.0. The transitions between the first 17 levels are dominated by Rydberg series of resonances converging to the levels of the 3s^2^3p^4^3d^2^ configuration. The present results and the calculation of Del Zanna et al. show significant differences for many weaker forbidden and intercombination transitions with thermally averaged collision strengths smaller than 0.01.2015ApJ...812..174Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/812/174CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/565/A77 : Atomic data for FeIX (Del Zanna+, 2014)J/A+A/537/A22 : Atomic data for X-ray lines of FeVIII & FeIX (O'Dwyer+, 2012)J/ApJ/743/206 : Effective collision strengths of FeVIII (Tayal+, 2011)J/ApJ/740/L52 : FeIX energy levels (Foster+, 2011)J/A+A/460/331 : Fe IX radiative and excitation rates (Aggarwal+, 2006)J/ApJS/164/297 : New relativistic atomic data for Fe IX (Verma+, 2006)J/A+A/394/753 : IRON Project. LI. (Storey+, 2002)J/A+A/410/359 : Radiative and Auger decay for Fe II-Fe IX (Palmeri+, 2003)http://www.chiantidatabase.org/ : The CHIANTI atomic databasehttp://www.nist.gov/pml/data/asd.cfm : NIST atomic spectra databasehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/812/174https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/812/174http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/812/174https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/812/174https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/812/174http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/812/174GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/812/174/table3Line strengths, oscillator strengths, and transition probabilities for E1 transitions in FeIXrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinti[1/302] Lower level indexmeta.idintk[3/370] Upper level indexmeta.idintlambda[72.2/7341923.5] Wavelength; in Angstroms0.1nmem.wldoubleS[0/98] Line strengthspect.line.intensitydoublefik[0/3.1] Oscillator strengthphys.atmol.oscStrengthdoubleAkiTransition probabilitys**-1phys.atmol.transProbdoubleJ/ApJ/812/174/table6Effective collision strengths for fine-structure transitions in FeIXrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinti[1/369] Lower level indexmeta.idintk[2/370] Upper level indexmeta.idintCS0.5Effective collision strength at 0.5E4Kphys.atmol.collStrengthdoubleCS1.0Effective collision strength at 1.0E4Kphys.atmol.collStrengthdoubleCS2.5Effective collision strength at 2.5E4Kphys.atmol.collStrengthdoubleCS5.0Effective collision strength at 5.0E4Kphys.atmol.collStrengthdoubleCS10Effective collision strength at 1.0E5Kphys.atmol.collStrengthdoubleCS25Effective collision strength at 2.5E5Kphys.atmol.collStrengthdoubleCS50Effective collision strength at 5.0E5Kphys.atmol.collStrengthdoubleCS100Effective collision strength at 1.0E6Kphys.atmol.collStrengthdoubleCS250Effective collision strength at 2.5E6Kphys.atmol.collStrengthdoubleCS500Effective collision strength at 5.0E6Kphys.atmol.collStrengthdoubleJ/ApJ/812/174/table2Comparison of target level energies with other calculations and excitation levels lifetimerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinti[1/370] Lower level indexmeta.idintLevelLevel designationmeta.id;meta.mainExpt[0/170.2]? NIST experimental target level energyeVphys.energy;phys.atmol.levelfloatnullablef_Expt[efg] Flag Expt (1)meta.codecharThis[0/179.1] This work's target level energyeVphys.energy;phys.atmol.levelfloatDiff-This[-1/2]? Difference between this work and NISTeVstat.fit.omc;phys.energyfloatnullableDZ14[0/177]? DZ14 target level energy (2)eVphys.energy;phys.atmol.levelfloatnullableDiff-DZ14[0/9]? Difference between DZ14 and NISTeVstat.fit.omc;phys.energyfloatnullableA06[0/170.9]? A06 target level energy (2)eVphys.energy;phys.atmol.levelfloatnullableDiff-A06[0/6]? Difference between A06 and NISTeVstat.fit.omc;phys.energyfloatnullableS02[0/175.5]? S02 target level energy (2)eVphys.energy;phys.atmol.levelfloatnullableDiff-S02[0/6]? Difference between S02 and NISTeVstat.fit.omc;phys.energyfloatnullabletau[0/578]? Excitation level lifetimestime.lifetime;phys.atmol.leveldoublenullable