J/ApJS/188/32ivo://CDS.VizieR/J/ApJS/188/32doi:10.26093/cds/vizier.21880032CDSTayal S.S.Zatsarinny O.2010-07-29T14:15:10Z2010-07-14T16:15:55ZCDS support team

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

cds-question@unistra.fratomic-physicsNew improved calculations are reported for transition probabilities and electron impact excitation collision strengths for the astrophysically important lines in SII. The collision strengths have been calculated in the close-coupling approximation using the B-spline Breit-Pauli R-matrix method. The multiconfiguration Hartree-Fock method with term-dependent non-orthogonal orbitals is employed for an accurate representation of the target wave functions. The close-coupling expansion includes 70 bound levels of SII covering all possible terms of the ground 3s^2^3p^3^ and singly excited 3s3p^4^, 3s^2^3p^2^3d, 3s^2^3p^2^4s, and 3s^2^3p^2^4p configurations. The present calculations are more extensive than previous ones, leading to a total 2415 transitions between fine-structure levels. The effective collision strengths are obtained by averaging the electron collision strengths over a Maxwellian distribution of velocities and these are tabulated for all fine-structure transitions at electron temperatures in the range from 5000 to 100000K. The present results are compared with a variety of other close-coupling calculations and available experimental data. There is an overall good agreement with the recent 18-state calculations by Ramsbottom, Bell, & Stafford and with the 19-state calculations by Tayal for the most part, but some significant differences are also noted for some transitions.2010ApJS..188...32Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/188/32CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/420/783 : Electron impact excitation of Fe XVII (Aggarwal+, 2004)J/A+A/430/725 : N II effective collision strengths (Hudson+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/188/32https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/188/32http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/188/32https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/188/32https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/188/32http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/188/32GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJS/188/32/table1Energies and lifetimes of the excitation levelsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIndex[1/70] Indexmeta.idintConfConfigurationphys.atmol.configurationLSJLSJ termphys.atmol.configurationEexpExpected excitation energyeVphys.atmol.excitationfloatEPresent excitation energyeVphys.atmol.excitationfloatdEExcitation energy difference (E-Eexp)eVphys.atmol.excitation;arith.difffloatLF? Present lifetimestime.lifetimedoublenullableLFM? Breit-Pauli MCHF lifetime (Irimia & Froese Fischer, 2007, Phys. Scr., 71, 172)stime.lifetimedoublenullableJ/ApJS/188/32/table4Line strengths, oscillator strengths, and transition probabilities for E1 transitionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintConf.iThe i level configurationphys.atmol.configurationConf.kThe k level configurationphys.atmol.configurationlambdaWavelength in Angstroms0.1nmem.wl;phys.atmol.transitiondoubleSikThe i-k transition line strengthspect.line.strengthdoublefikThe i-k transition oscillator strengthphys.atmol.wOscStrength;phys.atmol.transitiondoubleAkiThe i-k transition decay probabilitys**-1phys.atmol.transProbdoubleJ/ApJS/188/32/table5Effective collision strengths for transitions in SIIrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinti[1/69] The i level configurationmeta.idintk[2/70] The k level configurationmeta.idint0.5CSEffective collision strength at T=5kKphys.atmol.collStrengthdouble0.7CSEffective collision strength at T=7kKphys.atmol.collStrengthdouble1.0CSEffective collision strength at T=10kKphys.atmol.collStrengthdouble1.5CSEffective collision strength at T=15kKphys.atmol.collStrengthdouble2.0CSEffective collision strength at T=20kKphys.atmol.collStrengthdouble2.5CSEffective collision strength at T=25kKphys.atmol.collStrengthdouble3.0CSEffective collision strength at T=30kKphys.atmol.collStrengthdouble4.0CSEffective collision strength at T=40kKphys.atmol.collStrengthdouble5.0CSEffective collision strength at T=50kKphys.atmol.collStrengthdouble7.0CSEffective collision strength at T=70kKphys.atmol.collStrengthdouble10CSEffective collision strength at T=100kKphys.atmol.collStrengthdouble