Relativistic many-body calculations of electric-dipole transitions between<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>n</mml:mi><mml:mo>=</mml:mo><mml:mn>2</mml:mn><mml:mn /></mml:math>states in B-like ions

Safronova, U. I.; Johnson, W. R.; Livingston, A. E.

doi:10.1103/physreva.60.996

Cited by 57 publications

(51 citation statements)

References 62 publications

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“…Among the other comparisons, the present BPRM lifetimes for the 2s2p 2 ( 2 S , 2 P) levels, due to dipole allowed transitions to 2s 2 2p( 2 P o ), agree with measured values and with those by Galavis et al, but those by Safronova et al [24] are relatively higher. Safronova et al present transition rates for n = 2 levels using relativistic many body perturbation theory.…”

Section: Energies and Oscillator Strengths Of C Iisupporting

confidence: 79%

Fine Structure Radiative Transitions in C Ii and C Iii Using the Breit–pauli R-Matrix Method

Nahar

2002

Atomic Data and Nuclear Data Tables

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Extensive sets of radiative transitions in C II and in C III are obtained using the relativistic Breit-Pauli R-matrix (BPRM) method. In comparison with other accurate methods that can be applied to relatively few transitions, the BPRM method enables calculations of a large number of transitions with comparable accuracy for most of them. The present work reports large-scale calculations for two important ions obtaining 127 and 206 bound fine structure energy levels, resulting in 1681 and 4202 dipole allowed and intercombination transitions for C II and C III, respectively. Detailed comparison of the BPRM results is made with those from experimental and theoretical studies, including the relativistic multiconfiguration Dirac-Fock method. INTRODUCTIONThe Breit-Pauli R-matrix (BPRM) method [1] is being used to calculate a large number of oscillator strengths (f -values) [2][3][4][5]. The first large scale application of the BPRM method for the radiative transitions in Fe XXIV and Fe XXV [2] showed very good agreement, within 10%, of the f -values with the most accurate theoretical calculations available. Most of the experimental and theoretical studies for oscillator strengths and transition probabilities (A-values) are focused on a few or a limited number of transitions, whereas various spectral diagnostic models and astrophysical applications, such as plasma opacities, require f -or A-values for a very large number of transitions. Systematic calculations for radiative processes were carried out for most astrophysically abundant atoms and ions under the Opacity Project (OP [6][7][8][9]). The datasets obtained under the OP are available electronically through a database, TOPbase [10]. The calculations under the OP were carried out in LS coupling and no relativistic effects were considered. However, fine structure transitions, rather than LS multiplets, are needed for spectral diagnostics in astrophysical and laboratory plasmas. The Breit-Pauli R-matrix method developed under the Iron Project (IP, [1]) includes relativistic effects in the Breit-Pauli approximation [1,11,12] for collisional processes. Recently, the method has been extended to enable close coupling calculations of oscillator strengths (i) including the relativistic effects and (ii) considering a large number of transitions.The present study investigates the relativistic and electron-electron correlation effects in transitions of two important light ions, C II and C III. These two ions are of particular interest in the diagnostics of a number of astrophysical objects such as in early type stars and nebulae as well as in laboratory plasmas. THEORYProvided here is a brief summary of the the basics of the Breit-Pauli R-matrix method. The method for radiative bound-bound and bound-free transitions is derived from atomic collision theory and the coupled channel or close coupling (CC) approximation [1,6]. The computational method is based on the powerful R-matrix formalism that enables efficient, accurate, and large-scale calculations of compound (bound and c...

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Section: Energies and Oscillator Strengths Of C Iisupporting

confidence: 79%

Fine Structure Radiative Transitions in C Ii and C Iii Using the Breit–pauli R-Matrix Method

Nahar

2002

Atomic Data and Nuclear Data Tables

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“…The relativistic effects in those calculations were accounted for in the Breit-Pauli approximation. Safronova et al (1996Safronova et al ( , 1998Safronova et al ( , 1999 used relativistic many-body perturbation theory (RMBPT) to compute energies Tables of energy levels and transition rates are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/559/A100…”

Section: Introductionmentioning

confidence: 99%

Energy levels and transition rates for the boron isoelectronic sequence: Si X, Ti XVIII – Cu XXV

Jönsson

Ekman

Gustafsson

et al. 2013

A&A

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Relativistic configuration interaction (RCI) 2 4l (l = 0, 1, 2 and l = 0, 1, 2, 3) in boron-like ions Si X and Ti XVIII to Cu XXV. Electron correlation effects are represented in the wave functions by large configuration state function (CSF) expansions. States are transformed from j j-coupling to LS -coupling, and the LS -percentage compositions are used for labeling the levels. Radiative electric dipole transition rates are given for all ions, leading to massive data sets. Calculated energy levels are compared with other theoretical predictions and crosschecked against the Chianti database, NIST recommended values, and other observations. The accuracy of the calculations are high enough to facilitate the identification of observed spectral lines.

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“…Corresponding variant of RMBPT was developed in [47,48,49,50,51]. ] splitting in cm −1 for n = 2 are equal to 17 and 15; for n = 3 corresponding values are 123 and 112; finaly, for n = 6 we get 6710 and 7793 respectively.…”

Section: Energies Of In I and Sn Iimentioning

confidence: 99%

Relativistic all-order calculations ofInIandSnIIatomic properties

Safronova

Kozlov

2007

Phys. Rev. A

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We use all-order relativistic many-body perturbation theory to study 5s 2 nl configurations of In I and Sn II. Energies, E1-amplitudes, and hyperfine constants are calculated using all-order method, which accounts for single and double excitations of the Dirac-Fock wave functions. A comprehensive review of experimental and theoretical studies of In I and Sn II properties is given. Our results are compared with other studies were available.

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Relativistic many-body calculations of electric-dipole transitions betweenn=2states in B-like ions

Cited by 57 publications

References 62 publications

Fine Structure Radiative Transitions in C Ii and C Iii Using the Breit–pauli R-Matrix Method

Fine Structure Radiative Transitions in C Ii and C Iii Using the Breit–pauli R-Matrix Method

Energy levels and transition rates for the boron isoelectronic sequence: Si X, Ti XVIII – Cu XXV

Relativistic all-order calculations ofInIandSnIIatomic properties

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