Energy levels and radiative rates for transitions   in Ar XIII, Ar XIV and Ar XV

Aggarwal, K. M.; Keenan, F. P.; Nakazaki, Shinobu

doi:10.1051/0004-6361:20052847

Cited by 20 publications

(31 citation statements)

References 23 publications

(43 reference statements)

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“…the level order 19 and 20 are exchanged in our FAC1 and FAC2 results. Similar results were found by Aggarwal et al (2005). We note that the level ordering of FAC2 is consistent with those listed in the NIST database.…”

Section: Energy Levels and Wavelengthssupporting

confidence: 88%

“…We note that discrepancies of several magnitudes are found for a few weak transitions. Aggarwal et al (2005) suggested that this differences can be attributed to the different configurations involved in different calculations. Apart from this, strong level mixing and the different methods adopted in the calculations may also cause large differences (Liang et al 2009).…”

Section: Radiative Ratesmentioning

confidence: 99%

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K-shell energy levels and radiative rates for transitions in Si xi

Wei

Shi

Zhao

et al. 2010

A&A

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Context. Atomic data for K-shell transitions are essential for modeling the K absorption lines, which have been observed in the spectra of active galaxies by high-resolution X-ray observatories, e.g. XMM, Chandra, and Suzaku. These accurate atomic data are also needed for line identifications and spectroscopic diagnostic of plasmas in laboratory generated by laser or beam-foil method. Aims. We calculate atomic data using the atomic code flexible atomic code (FAC) taking relativistic effects and configuration interactions into account. Methods. We calculate the K-shell transitions among the configurations of 1s 2 2s 2 , 1s 2 2s2p, 1s 2 2p 2 , 1s 2 2sn l , 1s 2 2pn l , 1s2s 2 2p, 1s2s2p 2 , 1s2p 3 , 1s2s2pn l , and 1s2p 2 n l , n ≤ 4, l ≤ n for beryllium-like Si xi. We present the K-shell energy levels, wavelengths, radiative rates, and oscillator strengths for Si xi. To assess the accuracy of current data, we compare our results with both former experiments and other theoretical works.Results. The present K-shell level energies and wavelengths are accurate to within 2 eV and 10 mÅ, respectively. The radiative rates have an accuracy of around 20% for the majority of our transitions.

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Section: Energy Levels and Wavelengthssupporting

confidence: 88%

Section: Radiative Ratesmentioning

confidence: 99%

K-shell energy levels and radiative rates for transitions in Si xi

Wei

Shi

Zhao

et al. 2010

A&A

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“…For Ar 13+ , a grasp calculation is available, which included the 2s x 2p y (x + y = 3), 2s 2 {3, 4, 5}l, 2s2p{3, 4, 5}l, 2p 2 {3, 4, 5}l (l < f ), and 2s 2 {6, 7, 8}s configurations (Aggarwal et al 2005). Notes.…”

Section: Structure: Level Energiesmentioning

confidence: 99%

“…For Ar 13+ , the 460-level grasp calculation performed by Aggarwal et al (2005) is the largest-scale work for this ion to our best knowledge. We provide a comparison with their results, again in Fig.…”

Section: Structure: Line Strength Smentioning

confidence: 99%

R-matrix electron-impact excitation data for the B-like iso-electronic sequence

Liang

Badnell²,

Zhao

2012

A&A

101

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We have carried-out parallel intermediate-coupling frame transformation R-matrix calculations for electron-impact excitation amongst the 204 close-coupling levels of the 2sx 2p y (x + y = 3), 2s 2 {3, 4}l, 2s2p{3, 4}l, and 2p 2 3l configurations for all boron-like ions from C + to Kr 31+ . We have also included the configuration interaction due to the 2p 2 4l, 2s3l3l and 2p3s3l configurations. A detailed comparison has been made of the target structure and excitation data for four specific ions (viz., Ne 5+ , Ar 13+ , Fe 21+ and Kr 31+ ) that span the sequence, so as to assess the accuracy over the entire sequence. Effective collision strengths (Υs) are presented at temperatures ranging from 2 × 10 2 (z + 1) 2 K to 2 × 10 6 (z + 1) 2 K (where z is the residual charge of the ions, i.e. Z − 5). Detailed comparisons for the (effective) collision strengths (Υs) Ω are made with the results of previous calculations for the four representative ions. Furthermore, we examine the iso-electronic trends of the effective collision strengths as a function of temperature.

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“…Some calculations were performed for selected individual ions (Kramida & Träbert 1995;Tully & Chidichimo 2001Chidichimo et al 2003;Aggarwal et al 2005;Chidichimo et al 2005;Landi & Gu 2006;Savukov & Markhotok 2006;Bhatia & Landi 2007a, 2007bGu 2007;Duan et al 2008;Del Zanna et al 2008;, 2009a, 2009bHudson 2009;Mania et al 2009;Aggarwal & Keenan 2014). However, a majority of these calculations are at the level of a relatively simple configuration interaction method, which implies a relatively lower accuracy.…”

Section: Introductionmentioning

confidence: 99%

SYSTEMATIC CALCULATIONS OF ENERGY LEVELS AND TRANSITION RATES OF BE-LIKE IONS WITH Z = 10–30 USING A COMBINED CONFIGURATION INTERACTION AND MANY-BODY PERTURBATION THEORY APPROACH

Wang

Guo

Liu

et al. 2015

ApJS

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We report calculations of energy levels and radiative rates for transitions among the lowest 116 fine-structure levels arising from the ⩽ n 5 configurations in Be-like ions with Z = 10-30. The wavelengths, oscillator strengths, line strengths, and radiative rates for all possible electric dipole, magnetic dipole, electric quadrupole, and magnetic quadrupole transitions among the 116 levels have been calculated using the combined configuration interaction and many-body perturbation method. The accuracy of the results is determined through extensive comparisons with existing laboratory measurements and theoretical results. The present complete set of results should be of great help in line identification and the interpretation of spectra, as well as in the modeling and diagnostics of astrophysical and fusion plasmas.

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Energy levels and radiative rates for transitions in Ar XIII, Ar XIV and Ar XV

Cited by 20 publications

References 23 publications

K-shell energy levels and radiative rates for transitions in Si xi

K-shell energy levels and radiative rates for transitions in Si xi

R-matrix electron-impact excitation data for the B-like iso-electronic sequence

SYSTEMATIC CALCULATIONS OF ENERGY LEVELS AND TRANSITION RATES OF BE-LIKE IONS WITH Z = 10–30 USING A COMBINED CONFIGURATION INTERACTION AND MANY-BODY PERTURBATION THEORY APPROACH

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