Dielectronic recombination data for dynamic finite-density plasmas

XIV. The aluminium isoelectronic sequence

Sh. A. Abdel-Naby, D. Nikolić, T. W. Gorczyca, K. T. Korista, N. R. Badnell

Research output: Contribution to journalArticle

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Abstract

Context. 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.
Original languageEnglish
Article numberA40
Number of pages12
JournalAstronomy and Astrophysics
Volume537
DOIs
Publication statusPublished - 4 Jan 2012

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isoelectronic sequence
recombination
plasma density
aluminum
plasma
coefficients
ion
ions
fine structure
approximation
rate
excitation
calculation

Keywords

  • plasmas
  • atomic processes
  • scattering
  • atomic data

Cite this

@article{6205625b1d4448b1a2c278e34bf2d4da,
title = "Dielectronic recombination data for dynamic finite-density plasmas: XIV. The aluminium isoelectronic sequence",
abstract = "Context. 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.",
keywords = "plasmas, atomic processes, scattering, atomic data",
author = "Abdel-Naby, {Sh. A.} and D. Nikolić and Gorczyca, {T. W.} and Korista, {K. T.} and Badnell, {N. R.}",
note = "Reproduced with permission from Astronomy & Astrophysics, {\circledC} ESO 2012.",
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doi = "10.1051/0004-6361/201117544",
language = "English",
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Dielectronic recombination data for dynamic finite-density plasmas : XIV. The aluminium isoelectronic sequence. / Abdel-Naby, Sh. A.; Nikolić, D.; Gorczyca, T. W.; Korista, K. T.; Badnell, N. R.

In: Astronomy and Astrophysics, Vol. 537, A40, 04.01.2012.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Dielectronic recombination data for dynamic finite-density plasmas

T2 - XIV. The aluminium isoelectronic sequence

AU - Abdel-Naby, Sh. A.

AU - Nikolić, D.

AU - Gorczyca, T. W.

AU - Korista, K. T.

AU - Badnell, N. R.

N1 - Reproduced with permission from Astronomy & Astrophysics, © ESO 2012.

PY - 2012/1/4

Y1 - 2012/1/4

N2 - Context. 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.

AB - Context. 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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KW - atomic processes

KW - scattering

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