Dielectronic recombination data for dynamic finite-density plasmas XIV. The aluminum isoelectronic sequence

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DOIResolve DOI: http://doi.org/10.1051/0004-6361/201117544
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TypeArticle
Journal titleAstronomy & Astrophysics
ISSN0004-6361
1432-0746
Volume537
Article numberA40
Subjectplasmas; atomic processes; scattering; atomic data
AbstractContext. A comprehensive study of dielectronic recombination (DR) for the aluminum-like isoelectronic sequence has been completed. Aims. Total and final-state resolved DR rate coefficients for the ground and metastable initial levels of 17 ions between Si ii and Zn xviii are presented. Methods. Within an isolated-resonance, distorted-wave (IPIRDW) approximation, multiconfiguration Breit-Pauli (MCBP) calculations are carried out for the total and partial DR rate coefficients of Al-like ions. Both Δnc = 0 and Δnc = 1 core-excitations are included, using LS-coupled and intermediate-coupling (IC) schemes. Results. The inaccuracies of earlier empirical data and/or LS-coupling calculations, particularly at lower temperatures characteristic of photoionized plasmas, is demonstrated by comparison with present, state-of-the-art IC DR rate coefficients. Fine-structure effects are found to increase the DR rate coefficient at low temperatures and decrease it at high temperatures, rendering earlier LS calculations incomplete. Good agreement is found between present IC results and experimental measurements.
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LanguageEnglish
Peer reviewedYes
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NPARC number21268974
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Record identifier41b73c84-c4a4-40fe-b509-e9261d4c2b3f
Record created2013-11-28
Record modified2016-05-09
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