CIV3 and relativistic quantum defect orbital (RQDO) oscillator strengths in Mg-like ions of astrophysical interest

Almaraz, M. A.; Hibbert, A; Lavín, C.; Martı́n, I.; Bell, K L

doi:10.1088/0953-4075/33/17/309

Cited by 18 publications

(11 citation statements)

References 32 publications

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“…Interestingly, with a much smaller basis set, level energies for Fe XV from our group (Deb & Msezane 1998;Deb et al 1999) showed far better agreement with the measurement. However, their (Almaraz et al 2000) calculated oscillator strengths using MCDF agree closely with their length form of the CIV3 results as do the recent experimental values. Their RQDO method based on a simple model potential gave reasonably good oscillator strengths for the ions towards the neutral end of the sequence, but poor agreement with the measured data and both their CIV3 and MCDF for the 3s 2 ( 1 S 0 ) → 3s3p( 1 P 1 ) transition in Fe XV.…”

Section: Introductionsupporting

confidence: 82%

“…Almaraz et al (2000) have performed more extensive CIV3 calculations to study the configuration mixing among the levels involved in the 3s 2 ( 1 S 0 ) → 3snp( 1,3 P 1 ) (n = 3−5) transitions in Mg-like ions such as Si III, S V and Fe XV. They also used relativistic quantum defect orbital (RQDO) formalism and MCDF procedures in their investigations.…”

Section: Introductionmentioning

confidence: 99%

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Dipole allowed and intercombination transitions in K$^{\mathsf7+}$ and Ti$^{\mathsf{10+}}$ ions

Das

Deb

Roy

et al. 2004

A&A

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Abstract.We have calculated 87 fine-structure energy levels of K 7+ and Ti 10+ belonging to the lowest 14 configurations within the n = 3 and n = 4 complexes using Program CIV3 of Hibbert. Relativistic effects are included through the BreitPauli approximation. New improved results of oscillator strengths, transition probabilities and line strengths for all allowed and intercombination transitions among these fine-structure levels are calculated using large-scale configuration interaction wavefunctions. Lifetimes of some relatively longer-lived levels are also computed. Our results are compared with a wide variety of other calculations and available experimental data. It is noted that most of our results compare more favourably with the measurements than the other available theoretical results.

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Section: Introductionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Dipole allowed and intercombination transitions in K$^{\mathsf7+}$ and Ti$^{\mathsf{10+}}$ ions

Das

Deb

Roy

et al. 2004

A&A

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“…Safronova et al (2000) used relativistic second-order many body perturbation theory (MBPT) to calculate excitation energies and transition rates for the same transition arrays. Almaraz et al (2000) applied the CIV3 code (Hibbert 1975) to calculate energy levels and oscillator strengths in Si iii.…”

Section: Previous Work On Atomic Data For Si III and Si Ivmentioning

confidence: 99%

MCDHF and RCI calculations of energy levels, lifetimes, and transition rates in Si III and Si IV

Atalay

Brage

Jönsson

et al. 2019

A&A

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We present extensive multiconfiguration Dirac-Hartree-Fock and relativistic configuration interaction calculations including 106 states in doubly ionized silicon (Si iii) and 45 states in triply ionized silicon (Si iv), which are important for astrophysical determination of plasma properties in different objects. These calculations represents an important extension and improvement of earlier calculations especially for Si iii. The calculations are in good agreement with available experiments for excitation energies, transition properties, and lifetimes. Important deviations from the NIST-database for a selection of perturbed Rydberg series are discussed in detail.

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“…The line ratio calculations in turn need accurate determination of atomic data such as energy levels, oscillator strengths, transition probabilities and lifetimes. The calculations of these parameters for a number of allowed and intercombination transitions in Mg-like ions have been previously reported by many workers (Froese Fischer and Godefroid 1982a, 1982b, Fawcett 1983, Tayal 1986, Chou et al 1993, Stanek et al 1996, Jonsson and Froese Fischer 1997, Zou and Froese Fischer 2001, Butler et al 1993, Chen and Cheng 1997, Deb and Msezane 1998, Deb et al 1999, Almaraz et al 2000, Safronova et al 2000, Gupta and Msezane 2000, Biémont et al 2002, Aggarwal et al 2003, Das et al 2004. Most of the available theoretical data in the literature for highly charged Mg-like ions so far are confined to the calculation of energy levels (Ivanova et al 1986).…”

Section: Introductionmentioning

confidence: 97%

Fine-structure energy levels and lifetimes in Br XXIV

Tayal¹,

Gupta²

2005

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

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We have performed large-scale CIV3 calculations of excitation energies from the ground state for 48 fine-structure levels as well as of oscillator strengths and radiative decay rates for all electric-dipole-allowed and intercombination transitions among the (1s22s22p6)3s2(1S), 3s3p(1,3Po), 3s3d(1,3D), 3s4s(1,3S), 3s4p(1,3Po), 3s4d(1,3D), 3s4f(1,3Fo), 3p2(1S, 3P, 1D), 3p3d(1,3Po, 1,3Do, 1,3Fo), 3p4s(1,3Po) and 3d2(1S, 3P, 1D) states of Br XXIV. These states are represented by extensive configuration-interaction (CI) wavefunctions obtained using the CIV3 computer code of Hibbert. The relativistic effects in intermediate coupling are incorporated by means of the Breit–Pauli Hamiltonian which consists of the non-relativistic term plus the one-body mass correction, Darwin term, and spin–orbit, spin-other-orbit and spin–spin operators. Small adjustments to the diagonal elements of the Hamiltonian matrices have been made so that the energy splittings are as close as possible to the experimental values. Our calculated excitation energies, including their ordering, are in excellent agreement with the available experimental results except that the levels 1D2 and 3P2 belonging to the same configuration 3p2 interchanged their positions compared to the experiment. This interchange in our calculation is discussed and explained through eigenvector compositions of the two levels. From our radiative decay rates, we have calculated radiative lifetimes of some fine-structure levels. Our calculated lifetimes of the levels 3s3p(3P1) and 3s3p(1P1) are found to be in good agreement with the experimental and other theoretical results. In this calculation we also predict new data for several fine-structure levels where no other theoretical and experimental results are available.

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CIV3 and relativistic quantum defect orbital (RQDO) oscillator strengths in Mg-like ions of astrophysical interest

Cited by 18 publications

References 32 publications

Dipole allowed and intercombination transitions in K$^{\mathsf7+}$ and Ti$^{\mathsf{10+}}$ ions

Dipole allowed and intercombination transitions in K$^{\mathsf7+}$ and Ti$^{\mathsf{10+}}$ ions

MCDHF and RCI calculations of energy levels, lifetimes, and transition rates in Si III and Si IV

Fine-structure energy levels and lifetimes in Br XXIV

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CIV3 and relativistic quantum defect orbital (RQDO) oscillator strengths in Mg-like ions of astrophysical interest

Cited by 18 publications

References 32 publications

Dipole allowed and intercombination transitions in K$^{\mathsf7+}$ and Ti$^{\mathsf{10+}}$ ions

Dipole allowed and intercombination transitions in K$^{\mathsf7+}$ and Ti$^{\mathsf{10+}}$ ions

MCDHF and RCI calculations of energy levels, lifetimes, and transition rates in Si III and Si IV

Fine-structure energy levels and lifetimes in Br XXIV

Contact Info

Product

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About

MCDHF and RCI calculations of energy levels, lifetimes, and transition rates in Si III and Si IV