J/A+A/413/779ivo://CDS.VizieR/J/A+A/413/779doi:10.26093/cds/vizier.34130779CDSNahar S.N.2008-12-31T15:41:32Z2008-12-31T16:33:42ZCDS support team

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

cds-question@unistra.fratomic-physicsAn extensive set of oscillator strengths (f), line strengths (S) and radiative decay rates (A) for dipole allowed, intercombination and forbidden transitions in Fe XX is presented. Results include 1792 bound fine structure levels of total angular momenta J=1/2-19/2 of even and odd parities, with 2<=n<=10, 0<=l<=14, orbital angular momenta, 0<=L<=14, and total spin multiplicities 2S+1=2,4,6, yielding to about 3.8x10^5^ allowed and 13,874 forbidden transitions in Fe XX. These results far exceed the available data in literature. The existing data compiled by the National Institute for Standards and Technology (NIST) are available for little over one hundred transitions, and the previously calculated data under the Opacity Project includes 75 590 LS multiplets. The present ab initio calculations are carried out in the close coupling approximation using the relativistic Breit-Pauli R-matrix method for allowed and intercombination E1 transitions. The wavefunction expansion includes 20 fine structure levels of configurations 2s ^2^2p^2^, 2s2p^3^, and 2p^4^ of the core ion Fe XXI. Computed energy levels are identified spectroscopically using a newly developed procedure based on quantum defects and channel contributions. All 55 observed levels have been identified and are in agreement to much less than 1% with most of the calculated values. Coefficients for radiative decays for the forbidden E2, E3, M1 transitions are obtained through atomic structure calculations including relativistic terms in the Breit-Pauli approximation using the code SUPERSTRUCTURE. The theoretical transition probabilities are compared with available values, with varying degree of agreement. Erratum: A bug was detected and corrected in early 2007 in one of the stages called RECUPD (Storey, Berrington, Werner, 2007, private Iron Project communications) of the Breit-Pauli R-matrix (BPRM) codes of the Iron Project. It was related to the the phase factor of dipole matrix elements of the Iron Project (Berrington et al., 1995, Comput. Phys. Commun. 92, 290) and affected certain transition probabilities. The new results on energies and transition probabilities for Fe XX (Nahar, 2004, J/A+A/413/779, this paper) and Fe XVIII (Nahar, 2006, J/A+A/457/721) using the corrected code are replacing the earlier results at CDS. It should be noted that stage RECUPD in BPRM codes does not exist in the LS coupling R-matrix code from the Opacity Project (Berrington et al., 1987, J. Phys. B 20, 6379) and hence does not affect the non-relativistic results. Results for other ions, obtained using BPRM codes, did not indicate the bug effect when compared with existing results. However, I am repeating the calculations for these ions and will replace the earlier results. The E1 transition probabilities for Fe XX have been recomputed. The new files are: table3a, table3b -> fine structure energy levels of Fe XVIII table4a, table4b -> complete table of E1 fine structure transitions in Fe XVIII table5 -> table of fine structure transitions in Fe XVIII using observed energies In paper LXII (Fe XVIII), J/A+A/457/721, files were also corrected.2004A&A...413..779Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/413/779CatalogResearchIsServedByTAP 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/420/763 : IRON Project LV Ni II electron impact excitationJ/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/413/779https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/413/779http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/413/779https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/413/779https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/413/779http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/413/779GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/413/779/table4bFine structure transitionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetSet, as defined in set.dat filemeta.noteintiInitial level indexmeta.codeintjFinal level indexmeta.codeintwlWavelength of the transition0.1nmem.wl;phys.atmol.transitiondoubleindexedEiInitial energyRyphys.energy;phys.atmol.leveldoubleEjFinal energyRyphys.energydoublefLfL valuephys.atmol.oscStrengthdoubleSLine strengthspect.line.intensitydoubleAjiEinstein Aji coefficients**-1phys.atmol.transProbdoubleJ/A+A/413/779/table5Oscillator strengths corrected by observed energiesfOscillator strength (f value)phys.atmol.oscStrengthdoubleSLine strengthspect.line.intensitydoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCiInitial configurationphys.atmol.configurationcharCjFinal configurationphys.atmol.configurationcharslpiInitial core levelphys.atmol.configurationcharslpjFinal core levelphys.atmol.configurationchargiInitial statistical weight factorstat.weightintIi? Energy level index of 2Ji+1 (no value when Ci = LS)meta.idintnullablegjFinal statistical weight factorstat.weight;phys.atmol.finalintIj? Energy level index of 2Jj+1 (no value when Ci = LS)meta.idintnullableEij? Transition energy0.1nmphys.energy;phys.atmol.transitionfloatnullableARadiative decay rate (A-value)s**-1phys.atmol.transProbdoubleJ/A+A/413/779/table7Fine Structure energies (calculated): relativistic (BP)EEnergyRyphys.energydoubleConfConfiguration set (1)instr.setupcharkk valuecmphys.atmol.transitiondoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintie[1,215] Fine structure level numbermeta.idintSLp(cf)Core level (1)phys.atmol.configurationchargStatistical weight factor, g=(2J+1), with I=0 for J even, and I=1 for J oddphys.atmol.oscStrengthintJ/A+A/413/779/table8aForbidden E3 transitions in Breit-Pauli approximation (Nb of M2/E3 transitions = 3655)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNi[1,215] Initial numbermeta.idintNj[1,215] Final numbermeta.idintSLpCiInitial core levelphys.atmol.configurationcharSLpCjFinal core levelphys.atmol.configurationchargiInitial statistical weight factorphys.atmol.oscStrengthintgjFinal statistical weight factorphys.atmol.oscStrengthintwlWavelength in vacuum0.1nmem.wl;phys.atmol.transitiondoubleSE3E3 line strength (1)spect.line.strengthdoubleAE3Forbidden E3 transition probabilitys**-1phys.atmol.transProbdoubleJ/A+A/413/779/table8b*Forbidden E2 and M1 transitions in Breit-Pauli approximation. Number of E2,M1 transitions = 10219recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNi[1,215] Initial numbermeta.idintNj[1,215] Final numbermeta.idintSLpCiInitial core levelphys.atmol.configurationcharSLpCjFinal core levelphys.atmol.configurationchargiInitial statistical weight factorphys.atmol.oscStrengthintgjFinal statistical weight factorphys.atmol.oscStrengthintwlWavelength in vacuum0.1nmem.wl;phys.atmol.transitiondoubleSE2E2 line strength (1)spect.line.strengthdoubleAE2Forbidden E2 transition probabilitys**-1phys.atmol.transProbdoubleSM1M1 line strength (1)spect.line.strengthdoubleAM1Forbidden M1 transition probabilitys**-1phys.atmol.transProbdoubleJ/A+A/413/779/levelsEnergy levels (tables 3b and 4a)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinti[1,1832] Level indexmeta.idintJJ valuephys.atmol.qnfloatp[eo] Parity (o: odd, e: even)phys.atmol.paritychariiiLevel position index within J+pmeta.idintEobsEnergy (1)Ryphys.energydoubleconfConfigurationphys.atmol.configurationcharLSLS term (2)phys.atmol.qncharjjpiiiiEnergy level ids (3)meta.idintCtt configuration (2)phys.atmol.configurationcharSLpitt core levelphys.atmol.configurationcharJtJ value at t (2)phys.atmol.qncharnlPrincipal and orbital quantum numbers of the outer electronphys.atmol.configurationcharJvJ value of the outer electronphys.atmol.qncharEEnergyRyphys.energydoubleEQN? Effective Quantum Number (3)phys.atmol.qnfloatnullableTermsPossible LS terms of the energy levelphys.energy;phys.atmol.levelcharJ/A+A/413/779/setSet of initial and final g, P and N values for table4b.datNfFinal Nlv valuemeta.idintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetSet numbermeta.id;meta.mainintprimarygiInitial statistical weight factor (2J+1)stat.weightintPi[0/1] Initial parity valuephys.atmol.parityintgfFinal statistical weight factor (2J+1)stat.weight;phys.atmol.finalintPf[0/1] Final parity valuephys.atmol.parityintNiInitial Nlv valuemeta.idintNNTotal number of transitions in the setmeta.idint