J/A+A/592/A135ivo://CDS.VizieR/J/A+A/592/A135doi:10.26093/cds/vizier.35920135CDSFernandez-Menchero L.Del Zanna G.Badnell N.R.2018-03-13T09:18:43Z2016-08-18T19:17:27ZCDS support team

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

cds-question@unistra.fratomic-physicsEmission lines from highly-excited states (n>=5) of H- and He-like ions have been detected in astrophysical sources and fusion plasmas. For such excited states, R-matrix or distorted wave calculations for electron-impact excitation are very limited, due to the large size of the atomic basis set needed to describe them. Calculations for n>=6 are also not generally available. We study the behaviour of the electron-impact excitation collision strengths and effective collision strengths for the most important transitions used to model electron collision dominated astrophysical plasmas, solar, for example. We investigate the dependence on the relevant parameters: the principal quantum number n or the nuclear charge Z. We also estimate the importance of coupling to highly-excited states and the continuum by comparing the results of different sized calculations. We provide analytic formulae to calculate the electron-impact excitation collision strengths and effective collision strengths to highly-excited states (n>=8) of H- and He-like ions. These extrapolated effective collision strengths can be used to interpret astrophysical and fusion plasma via collisional-radiative modelling.2016A&A...592A.135Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/592/A135CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/592/A135https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/592/A135http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/592/A135https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/592/A135https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/592/A135http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/592/A135GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/592/A135/si13_t3Radiative data (gf) for the ion Si XIII calculated and extrapolatedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintI1Lower level index (as in s15_t1 or si13_t1 tables)meta.idintI2Upper level index (as in s15_t1 or si13_t1 tables)meta.idintAEinstein A coefficient for dipole transitions calculated and extrapolated (1)s**-1phys.atmol.transProbdoubleJ/A+A/592/A135/si13_t1Level energies for ion Si XIII, calculated and extrapolatedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintILevel indexmeta.idintCFConfiguration (largest weight)phys.atmol.configurationcharS(2S+1) term spin designation (largest weight)phys.atmol.qnintLL term designation (largest weight)phys.atmol.qncharJLevel total angular momentumphys.angMomentum;phys.atmol.levelfloatEobsTerm energy, observed NIST (1)cm**-1phys.energy;phys.atmol.leveldoubleEteoTerm energy, calculated and extrapolatedcm**-1phys.energy;phys.atmol.leveldoubleJ/A+A/592/A135/si13_t2Electron-impact effective collision strengths (Upsilon) for the ion Si XIII calculated (W2005a) and extrapolatedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintI1Lower level index (as in si13_t1 table)meta.idintI2Upper level index (as in si13_t1 table)meta.idintUps1Electron-impact effective collision strengths for Te=3.38+04K calculated (W2005a) and extrapolated (1)phys.atmol.collStrengthdoubleUps2Electron-impact effective collision strengths for Te=8.45+04K calculated (W2005a) and extrapolated (1)phys.atmol.collStrengthdoubleUps3Electron-impact effective collision strengths for Te=1.69+05K calculated (W2005a) and extrapolated (1)phys.atmol.collStrengthdoubleUps4Electron-impact effective collision strengths for Te=3.38+05K calculated (W2005a) and extrapolated (1)phys.atmol.collStrengthdoubleUps5Electron-impact effective collision strengths for Te=8.45+05K calculated (W2005a) and extrapolated (1)phys.atmol.collStrengthdoubleUps6Electron-impact effective collision strengths for Te=1.69+06K calculated (W2005a) and extrapolated (1)phys.atmol.collStrengthdoubleUps7Electron-impact effective collision strengths for Te=3.38+06K calculated (W2005a) and extrapolated (1)phys.atmol.collStrengthdoubleUps8Electron-impact effective collision strengths for Te=8.45+06K calculated (W2005a) and extrapolated (1)phys.atmol.collStrengthdoubleUps9Electron-impact effective collision strengths for Te=1.69+07K calculated (W2005a) and extrapolated (1)phys.atmol.collStrengthdoubleUps10Electron-impact effective collision strengths for Te=3.38+07K calculated (W2005a) and extrapolated (1)phys.atmol.collStrengthdoubleUps11Electron-impact effective collision strengths for Te=8.45+07K calculated (W2005a) and extrapolated (1)phys.atmol.collStrengthdoubleUps12Electron-impact effective collision strengths for Te=1.69+08K calculated (W2005a) and extrapolated (1)phys.atmol.collStrengthdoubleUps13Electron-impact effective collision strengths for Te=3.38+08K calculated (W2005a) and extrapolated (1)phys.atmol.collStrengthdoubleJ/A+A/592/A135/s15_t1Level energies for ion S XV, calculated and extrapolatedJLevel total angular momentumphys.angMomentum;phys.atmol.levelfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintILevel indexmeta.idintCFConfiguration (largest weight)phys.atmol.configurationcharS(2S+1) term spin designation (largest weight)phys.atmol.qnintLL term designation (largest weight)phys.atmol.qncharEobsTerm energy, observed NIST (1)cm**-1phys.energy;phys.atmol.leveldoubleEteoTerm energy, calculated and extrapolatedcm**-1phys.energy;phys.atmol.leveldoubleJ/A+A/592/A135/s15_t2Electron-impact effective collision strengths (Upsilon) for the ion S XV calculated (W2005b) and extrapolatedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintI1Lower level index (as in s15_t1 table)meta.idintI2Upper level index (as in s15_t1 table)meta.idintUps1Electron-impact effective collision strengths for Te=4.50+04K calculated (W2005b) and extrapolated (1)phys.atmol.collStrengthdoubleUps2Electron-impact effective collision strengths for Te=1.12+05K calculated (W2005b) and extrapolated (1)phys.atmol.collStrengthdoubleUps3Electron-impact effective collision strengths for Te=2.25+05K calculated (W2005b) and extrapolated (1)phys.atmol.collStrengthdoubleUps4Electron-impact effective collision strengths for Te=4.50+05K calculated (W2005b) and extrapolated (1)phys.atmol.collStrengthdoubleUps5Electron-impact effective collision strengths for Te=1.12+06K calculated (W2005b) and extrapolated (1)phys.atmol.collStrengthdoubleUps6Electron-impact effective collision strengths for Te=2.25+06K calculated (W2005b) and extrapolated (1)phys.atmol.collStrengthdoubleUps7Electron-impact effective collision strengths for Te=4.50+06K calculated (W2005b) and extrapolated (1)phys.atmol.collStrengthdoubleUps8Electron-impact effective collision strengths for Te=1.12+07K calculated (W2005b) and extrapolated (1)phys.atmol.collStrengthdoubleUps9Electron-impact effective collision strengths for Te=2.25+07 calculated (W2005b) and extrapolated (1)phys.atmol.collStrengthdoubleUps10Electron-impact effective collision strengths for Te=4.50+07K calculated (W2005b) and extrapolated (1)phys.atmol.collStrengthdoubleUps11Electron-impact effective collision strengths for Te=1.12+08K calculated (W2005b) and extrapolated (1)phys.atmol.collStrengthdoubleUps12Electron-impact effective collision strengths for Te=2.25+08K calculated (W2005b) and extrapolated (1)phys.atmol.collStrengthdoubleUps13Electron-impact effective collision strengths for Te=4.50+08K calculated (W2005b) and extrapolated (1)phys.atmol.collStrengthdoubleJ/A+A/592/A135/s15_t3Radiative data (gf) for the ion S XV calculated and extrapolatedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintI1Lower level index (as in s15_t1 or si13_t1 tables)meta.idintI2Upper level index (as in s15_t1 or si13_t1 tables)meta.idintAEinstein A coefficient for dipole transitions calculated and extrapolated (1)s**-1phys.atmol.transProbdouble