J/A+A/420/763ivo://CDS.VizieR/J/A+A/420/763doi:10.26093/cds/vizier.34200763CDSBautista M.A.2004-07-22T20:54:17Z2004-07-22T20:53:47ZCDS support team

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

cds-question@unistra.fratomic-physicsWe study the effects of using a 4d{bar} pseudo-orbital on the collision strengths for electron impact excitations of forbidden transitions in Ni II computed in the close coupling approximation. It is found that the resonance structures of the collision strengths are quite sensitive to the way the pseudo-orbital is created. Further, the close coupling expansion with a single 4d{bar} orbital does not converge, resulting in a poor representation of (N+1)-electrons auto-ionizing states. Much greater expansions are needed to properly represent resonance structures in electron impact excitation calculations, resulting in variations of up to factors of two, with respect to previous computations, in the Maxwellian averaged excitation rate coefficients.2004A&A...420..763Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/420/763CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/103/273 : IRON Project II IR collision strengths of C-like ionsJ/A+A/283/319 : IRON Project III B-like ionsJ/A+AS/108/1 : IRON Project V Collision strengths of O-like ionsJ/A+A/293/953 : IRON Project VI Fe II collision strengthsJ/A+A/293/967 : IRON Project VII Fe II radiative transitionsJ/A+AS/109/193 : IRON Project VIII Electron excitation of Ti-like ionsJ/A+AS/119/509 : IRON Project XVII Radiative transition in Fe IIIJ/A+AS/119/523 : IRON Project XVIII Electron impact for Fe IIIJ/A+AS/120/361 : IRON Project XIX Fe II radiative transitionsJ/A+AS/123/159 : IRON Project XXII C and O radiative ratesJ/A+AS/123/575 : IRON Project XXIII Fe XXII excitation rate coefficientsJ/A+AS/126/373 : IRON Project XXVII Fe IV collision strengthsJ/A+AS/131/499 : IRON Project XXIX Boron isoelectronic sequenceJ/A+AS/131/153 : IRON Project XXXI Fe XII electron excitationJ/A+AS/135/347 : IRON Project XXXV Fe XXIV & Fe XXV oscillator strengthsJ/A+AS/136/395 : IRON Project XXXVII Fe VI collision strengthsJ/A+AS/137/165 : IRON Project XXXVIII Fe XV fine-structure transitionsJ/A+AS/143/483 : IRON Project XLII Fe XXI electron impact excitationJ/A+AS/144/141 : IRON Project XLIII Fe V transition probabilitiesJ/A+AS/147/111 : IRON Project XLIV Fe VI trans. prob. & line ratioJ/A+AS/147/253 : IRON Project XLV Ar XIII, Fe XXI trans. probabilitiesJ/A+A/365/268 : IRON Project XLVII Ni III electron impact excitationJ/A+A/372/1078 : IRON Project XLIX Fe XX electron impact excitationJ/A+A/372/1083 : IRON Project L Fe XIX electron impact excitationJ/A+A/394/753 : IRON Project LI Fe IX electron impact excitationJ/A+A/408/789 : Iron Project LIII Fe XVII transition probabilitiesJ/A+A/413/779 : Iron Project LIV Fe XX transition probabilitiesJ/A+A/437/345 : IRON Project LIX Fe IV transition probabilitiesJ/A+A/448/779 : IRON Project LXI Fe IV radiative transitionsJ/A+A/457/721 : IRON Project LXII Fe XVIII allowed and forbidden trans.J/A+A/466/763 : IRON Project LXIII Fe^19+^ electron impact excitationhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/420/763https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/420/763http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/420/763https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/420/763https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/420/763http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/420/763GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/420/763/levelEnergy levelsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIndexLevel indexmeta.idintLevelConfigurationphys.atmol.configurationJTotal orbital numberphys.atmol.qnfloatEEnergycm**-1phys.energy;phys.atmol.leveldoubleJ/A+A/420/763/tableEffective collision strengthsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintILower level indexmeta.idintJUpper level indexmeta.idintECS1Effective collision strength at T=2.0000E+03Kphys.atmol.collStrengthdoubleECS2Effective collision strength at T=3.0000E+03Kphys.atmol.collStrengthdoubleECS3Effective collision strength at T=5.0000E+03Kphys.atmol.collStrengthdoubleECS4Effective collision strength at T=6.5000E+03Kphys.atmol.collStrengthdoubleECS5Effective collision strength at T=8.0000E+03Kphys.atmol.collStrengthdoubleECS6Effective collision strength at T=1.0000E+04Kphys.atmol.collStrengthdoubleECS7Effective collision strength at T=1.2000E+04Kphys.atmol.collStrengthdoubleECS8Effective collision strength at T=1.5000E+04Kphys.atmol.collStrengthdoubleECS9Effective collision strength at T=2.0000E+04Kphys.atmol.collStrengthdoubleECS10Effective collision strength at T=3.0000E+04Kphys.atmol.collStrengthdouble