J/ApJ/787/2ivo://CDS.VizieR/J/ApJ/787/2doi:10.26093/cds/vizier.17870002CDSSossah A.M.Tayal S.S.2017-09-25T14:13:02Z2017-08-23T06:43:42ZCDS support team

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

cds-question@unistra.fratomic-physicsThe effective collision strengths for electron-impact excitation of fine-structure transitions in Si VII are calculated as a function of electron temperature in the range 5000-2000000 K. The B-spline Breit-Pauli R-matrix method has been used to calculate collision strengths by electron impact. The target wave functions have been obtained using the multi-configuration Hartree-Fock method with term-dependent non-orthogonal orbitals. The 92 fine-structure levels belonging to the 46 LS states of 2s^2^2p^4^, 2s2p^5^, 2p^6^, 2s^2^2p^3^3s, 2s^2^2p^3^3p, 2s^2^2p^3^3d, and 2s2p^4^3s configurations are included in our calculations of oscillator strengths and collision strengths. There are 4186 possible fine-structure allowed and forbidden transitions among the 92 levels. The present excitation energies, oscillator strengths, and collision strengths have been compared with previous theoretical results and available experimental data. Generally, a good agreement is found with the 6 LS-state close-coupling approximation results of Butler & Zeippen (1994, J/A+AS/108/1) and the 44 LS-state distorted wave calculation of Bhatia & Landi (2003ApJ...585..587B).2014ApJ...787....2Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/787/2CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+AS/108/1 : IRON Project. V. O-like ions (Butler+, 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/787/2https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/787/2http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/787/2https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/787/2https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/787/2http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/787/2GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/787/2/table4Wavelengths, Oscillator Strengths, and Transition Probabilities for Electric Dipole (E1) Transitions among LSJ Levels in Si VIIfFinal Levelmeta.idrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintiInitial Levelmeta.idgi[1/9] Initial level statistical weightstat.weight;phys.atmol.initial;phys.atmol.levelintgf[1/11] Final level statistical weightstat.weight;phys.atmolintWaveWavelength in Angstroms0.1nmem.wl;phys.atmol.transitiondoublefLLength oscillator strengthphys.atmol.oscStrengthdoublefVVelocity oscillator strengthphys.veloc;phys.atmol.oscStrengthdoubleALTransition probabilitys**-1phys.atmol.transProbdoubleJ/ApJ/787/2/table1Comparison of Energy Levels and Lifetimes in Si VIIrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIndex[1/92] Indexmeta.idintCouplingCFG-LSJ couplingmeta.id;phys.atmol.transitionEaPresent excitation energy MCHF calculations with 2665 configurationsRyphys.atmol.excitationdoubleEbPresent excitation energy MCHF calculations with 488 configurationsRyphys.atmol.excitationdoubleEObs? Observed excitation energy (1)Ryphys.atmol.excitationdoublenullablen_EObs[*+] Note on Eobs (2)meta.notecharECCF? CCF excitation energy (3)Ryphys.atmol.excitationdoublenullableEBHA? BHA excitation energy (4)Ryphys.atmol.excitationdoublenullableEBZ? BZ excitation energy (5)Ryphys.atmol.excitationdoublenullableLifeP? Present lifetimenstime.lifetimedoublenullableLifeCFF? CFF lifetimenstime.lifetimedoublenullableJ/ApJ/787/2/table5Effective Collision Strengths for Fine-Structure Transitions among the 92 LSJ Levels of Si VIIrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinti[1/91] Initial levelmeta.idintf[2/92] Final levelmeta.idintCS0.5Effective collision strength at 5000 Kphys.atmol.collStrengthdoubleCS1Effective collision strength at 10000 Kphys.atmol.collStrengthdoubleCS2.5Effective collision strength at 25000 Kphys.atmol.collStrengthdoubleCS5Effective collision strength at 50000 Kphys.atmol.collStrengthdoubleCS7.5Effective collision strength at 75000 Kphys.atmol.collStrengthdoubleCS10Effective collision strength at 100000 Kphys.atmol.collStrengthdoubleCS20Effective collision strength at 200000 Kphys.atmol.collStrengthdoubleCS40Effective collision strength at 400000 Kphys.atmol.collStrengthdoubleCS60Effective collision strength at 600000 Kphys.atmol.collStrengthdoubleCS80Effective collision strength at 800000 Kphys.atmol.collStrengthdoubleCS100Effective collision strength at 1000000 Kphys.atmol.collStrengthdoubleCS200Effective collision strength at 2000000 Kphys.atmol.collStrengthdouble