Relativistic effects in many electron atoms

Glass, R. C.; Hibbert, A

doi:10.1016/0010-4655(78)90105-4

Cited by 226 publications

(157 citation statements)

References 21 publications

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“…In table 7 the specific mass shift parameters and electron densities are shown for all ions. Most notable is perhaps how the specific mass shift parameters for 2s2p 3 3 P o and 2s2p 3 8. A positive sign of the transition isotope shift corresponds to a larger energy transition (i.e.…”

Section: Results and Evaluation Of Datamentioning

confidence: 99%

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Relativistic configuration interaction calculations of energy levels, isotope shifts, hyperfine structures, and transition rates in the 2s²2p²–2s2p³transition array for the carbon-like sequence

Jönsson

Bieroń

2010

J. Phys. B: At. Mol. Opt. Phys.

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Energy levels, fine-structure separations, specific mass shift parameters, isotope shifts, hyperfine interaction constants, Landé g J -factors and transition probabilities are reported for the 2s 2 2p 2 -2s2p 3 transition array in N II, O III, F IV, Ne V and Ti XVII. Wavefunctions were determined using the multiconfiguration Dirac-Hartree-Fock method with account for valence, core-valence and core-core correlation effects. The transition energies and rates are compared with experimental data and with values from other calculations.

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Section: Results and Evaluation Of Datamentioning

confidence: 99%

“…A number of general computer codes such as SUPERSTRUCTURE, CIV3 and ATSP2K have been developed [4][5][6] to provide for these extensive data needs. These codes rely on the Breit-Pauli approximation [7,8] …”

Section: Introductionmentioning

confidence: 99%

Relativistic configuration interaction calculations of energy levels, isotope shifts, hyperfine structures, and transition rates in the 2s²2p²–2s2p³transition array for the carbon-like sequence

Jönsson

Bieroń

2010

J. Phys. B: At. Mol. Opt. Phys.

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“…We use the general configuration interaction program CIV3 (Hibbert 1975;Glass & Hibbert 1978;Hibbert et al 1991). The configuration interaction (CI) wavefunction in intermediate (LS J) coupling take the form…”

Section: Theoretical Methodsmentioning

confidence: 99%

Radiative transition rates for the forbidden lines in Fe II

Deb

Hibbert

2011

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Aims. We report electric quadrupole and magnetic dipole transitions among the levels belonging to 3d 6 4s, 3d 7 and 3d 5 4s 2 configurations of Fe II in a large scale configuration interaction (CI) calculation. Methods. The CIV3 code developed by Hibbert and coworkers is used to determine configuration interaction wave functions for these levels: for the optimisation of two different sets of orbitals based on alternative choices of the 3d function, for creating and diagonalising the Hamiltonian matrices and finally for calculating transition probabilities.Results. Where possible, we have used experimental energies, not only for transition energies but also to enhance the accuracy of our ab initio CI expansions. We compare our results with those of other authors, and discuss differences between them. The good agreement between our results obtained for the same transitions but with different d-functions indicates that we have treated the state dependence of the d-functions sufficiently well. Most of our results are available in electronic form as an appendix to the paper. Conclusions. Our analysis of our own results and those of others suggests that many of our transition rates are more accurate than the rather conservative 20−30% we have stated in the text, though in a small proportion of transitions, we could not justify an accuracy greater than this.

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“…The calculations described here have been undertaken with the code CIV3 (Hibbert 1975;Glass & Hibbert 1978;Hibbert et al 1991). For the 1s, 2s, 2p, 3s, 3p, and 4s orbitals we used the Hartree-Fock radial functions given by Clementi & Roetti (1974) for the [1s 2 2s 2 2p 6 3s 2 3p 6 ]3d4s 3 D state.…”

Section: Calculationsmentioning

confidence: 99%

The FERRUM project: experimental and theoretical transition rates of forbidden [Sc II] lines and radiative lifetimes of metastable Sc II levels

Hartman¹,

Gurell

Lundin

et al. 2008

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Context. In many plasmas, long-lived metastable atomic levels are depopulated by collisions (quenched) before they decay radiatively. In low-density regions, however, the low collision rate may allow depopulation by electric dipole (E1) forbidden radiative transitions, so-called forbidden lines (mainly M1 and E2 transitions). If the atomic transition data are known, these lines are indicators of physical plasma conditions and used for abundance determination. Aims. Transition rates can be derived by combining relative intensities between the decay channels, so-called branching fractions (BFs), and the radiative lifetime of the common upper level. We use this approach for forbidden [Sc ii] lines, along with new calculations. Methods. Neither BFs for forbidden lines, nor lifetimes of metastable levels, are easily measured in a laboratory. Therefore, astrophysical BFs measured in Space Telescope Imaging Spectrograph (STIS) spectra of the strontium filament of Eta Carinae are combined with lifetime measurements using a laser probing technique on a stored ion-beam (CRYRING facility, MSL, Stockholm). These quantities are used to derive the absolute transition rates (A-values). New theoretical transition rates and lifetimes are calulated using the CIV3 code.Results. We report experimental lifetimes of the Sc ii levels 3d 2 a 3 P 0,1,2 with lifetimes 1.28, 1.42, and 1.24 s, respectively, and transition rates for lines from these levels down to 3d4s a 3 D in the region 8270−8390 Å. These are the most important forbidden [Sc ii] transitions. New calculations for lines and metastable lifetimes are also presented, and are in good agreement with the experimental data.

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Relativistic effects in many electron atoms

Cited by 226 publications

References 21 publications

Relativistic configuration interaction calculations of energy levels, isotope shifts, hyperfine structures, and transition rates in the 2s²2p²–2s2p³transition array for the carbon-like sequence

Relativistic configuration interaction calculations of energy levels, isotope shifts, hyperfine structures, and transition rates in the 2s²2p²–2s2p³transition array for the carbon-like sequence

Radiative transition rates for the forbidden lines in Fe II

The FERRUM project: experimental and theoretical transition rates of forbidden [Sc II] lines and radiative lifetimes of metastable Sc II levels

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Relativistic effects in many electron atoms

Cited by 226 publications

References 21 publications

Relativistic configuration interaction calculations of energy levels, isotope shifts, hyperfine structures, and transition rates in the 2s22p2–2s2p3transition array for the carbon-like sequence

Relativistic configuration interaction calculations of energy levels, isotope shifts, hyperfine structures, and transition rates in the 2s22p2–2s2p3transition array for the carbon-like sequence

Radiative transition rates for the forbidden lines in Fe II

The FERRUM project: experimental and theoretical transition rates of forbidden [Sc II] lines and radiative lifetimes of metastable Sc II levels

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Relativistic configuration interaction calculations of energy levels, isotope shifts, hyperfine structures, and transition rates in the 2s²2p²–2s2p³transition array for the carbon-like sequence

Relativistic configuration interaction calculations of energy levels, isotope shifts, hyperfine structures, and transition rates in the 2s²2p²–2s2p³transition array for the carbon-like sequence