J/ApJS/196/24ivo://CDS.VizieR/J/ApJS/196/24doi:10.26093/cds/vizier.21960024CDSWasson I.R.Ramsbottom C.A.Scott M.P.2012-01-03T16:56:35Z2011-12-07T13:59:01ZCDS support team

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

cds-question@unistra.fratomic-physicsIn this paper, we present electron-impact excitation collision strengths and Maxwellian averaged effective collision strengths for the complicated iron-peak ion CrII. We consider specifically the allowed lines for transitions from the 3d^5^ and 3d^4^4s even parity configuration states to the 3d^4^4p odd parity configuration levels. The parallel suite of R-Matrix packages, RMATRX II, which have recently been extended to allow for the inclusion of relativistic effects, were used to compute the collision cross sections. A total of 108 LS{pi}/280J{pi} levels from the basis configurations 3d^5^, 3d^4^4s, and 3d^4^4p were included in the wavefunction representation of the target including all doublet, quartet, and sextet terms. Configuration interaction and correlation effects were carefully considered by the inclusion of seven more configurations and a pseudo-corrector {overline}4d type orbital. The 10 configurations incorporated into the CrII model thus listed are 3d^5^, 3d^4^4s, 3d^4^4p, 3d^3^4s^2^, 3d^3^4p^2^, 3d^3^4s4p, 3d^4^{overline}{4d}, 3d^3^4s{overline}{4d}, 3d^3^4p{overline}{4d}, and 3d^3^{overline}{4d}^2^, constituting the largest CrII target model considered to date in a scattering calculation. The Maxwellian averaged effective collision strengths are computed for a wide range of electron temperatures 2000-100000K which are astrophysically significant. Care has been taken to ensure that the partial wave contributions to the collision strengths for these allowed lines have converged with "top-up" from the Burgess-Tully sum rule incorporated. Comparisons are made with the results of Bautista et al. and significant differences are found for some of the optically allowed lines considered.2011ApJS..196...24Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/196/24CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/524/A35 : Effective collision strengths of CrII (Wasson+, 2010)J/A+A/511/A68 : Transitions of CrII (Gurell+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/196/24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/196/24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/196/24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/196/24https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/196/24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/196/24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJS/196/24/table3Theoretical oscillator strengths and transition probabilities between all allowed fine structure transitions of Cr IIrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinti[1,272] Lower levelmeta.idintj[75,274] Upper levelmeta.idintJ(i)Lower level angular momentumphys.atmol.qnfloatnullableJ(j)Upper level angular momentumphys.atmol.qnfloatnullabledEEnergy difference between upper and lower levelseVphys.energy;phys.atmol.leveldoubleFlenLength oscillator strengthphys.atmol.oscStrengthdoubleFvelVelocity oscillator strengthphys.veloc;phys.atmol.oscStrengthdoubleAlenLength transition probabilityphys.atmol.transProbdoubleAvelVelocity transition probabilityphys.veloc;phys.atmol.transProbdoubleJ/ApJS/196/24/table4Maxwellian averaged effective collision strengths against temperature for allowed fine structure transitions of Cr II. Configurations are indexed by Table 1.i[1,272] Lower levelmeta.idintj[75,280] Upper levelmeta.idintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintECS2kEffective collision strength at 2000Kphys.atmol.collStrengthdoubleECS2.3kEffective collision strength at 2300Kphys.atmol.collStrengthdoubleECS2.5kEffective collision strength at 2500Kphys.atmol.collStrengthdoubleECS5kEffective collision strength at 5000Kphys.atmol.collStrengthdoubleECS7.5kEffective collision strength at 7500Kphys.atmol.collStrengthdoubleECS10kEffective collision strength at 10000Kphys.atmol.collStrengthdoubleECS13kEffective collision strength at 13000Kphys.atmol.collStrengthdoubleECS15kEffective collision strength at 15000Kphys.atmol.collStrengthdoubleECS18kEffective collision strength at 18000Kphys.atmol.collStrengthdoubleECS20kEffective collision strength at 20000Kphys.atmol.collStrengthdoubleECS30kEffective collision strength at 30000Kphys.atmol.collStrengthdoubleECS40kEffective collision strength at 40000Kphys.atmol.collStrengthdoubleECS50kEffective collision strength at 50000Kphys.atmol.collStrengthdoubleECS60kEffective collision strength at 60000Kphys.atmol.collStrengthdoubleECS70kEffective collision strength at 70000Kphys.atmol.collStrengthdoubleECS80kEffective collision strength at 80000Kphys.atmol.collStrengthdoubleECS90kEffective collision strength at 90000Kphys.atmol.collStrengthdoubleECS100kEffective collision strength at 100000Kphys.atmol.collStrengthdoubleJ/ApJS/196/24/table1Energy levels for all fine-structure target states of CrII considered in the present workrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIndex[1,280] Index valuemeta.idintConfigConfigurationphys.atmol.configuration;instr.setupLSLS statephys.atmol.configurationJLevelmeta.id;phys.atmol.levelfloatnullableEEnergy (in Rydbergs relative to the 3d^5^ ^6^S^e^_5/2_ ground state)Ryphys.energy;phys.atmol.leveldouble