Extended transition rates and lifetimes in Al I and Al II from systematic multiconfiguration calculations

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Extended transition rates and lifetimes in Al I and Al II from systematic multiconfiguration calculations

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Publication Article, peer reviewed scientific
Title Extended transition rates and lifetimes in Al I and Al II from systematic multiconfiguration calculations
Author Papoulia, Asimina ; Ekman, Jörgen ; Jönsson, Per
Date 2018
English abstract
MultiConfiguration Dirac-Hartree-Fock (MCDHF) and relativistic configuration interaction (RCI) calculations were performed for 28 and 78 states in neutral and singly ionized aluminium, respectively. In Al I, the configurations of interest are 3s(2)nl for n = 3, 4, 5 with l = 0 to 4, as well as 3s3p(2) and 3s(2)6l for l = 0, 1, 2. In Al II, in addition to the ground configuration 3s(2), the studied configurations are 3snl with n = 3 to 6 and l = 0 to 5, 3p(2), 3s7s, 3s7p, and 3p3d. Valence and core-valence electron correlation effects are systematically accounted for through large configuration state function (CSF) expansions. Calculated excitation energies are found to be in excellent agreement with experimental data from the National Institute of Standards and Technology (NIST) database. Lifetimes and transition data for radiative electric dipole (E1) transitions are given and compared with results from previous calculations and available measurements for both Al I and Al II. The computed lifetimes of Al I are in very good agreement with the measured lifetimes in high-precision laser spectroscopy experiments. The present calculations provide a substantial amount of updated atomic data, including transition data in the infrared region. This is particularly important since the new generation of telescopes are designed for this region. There is a significant improvement in accuracy, in particular for the more complex system of neutral Al I. The complete tables of transition data are available at the CDS.
DOI https://doi.org/10.1051/0004-6361/201833764 (link to publisher's fulltext.)
Publisher EDP Sciences
Host/Issue Astronomy & Astrophysics;
Volume 621
ISSN 1432-0746
Language eng (iso)
Subject atomic data
Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/29540 Permalink to this page
Link to publication in DiVA Find this research publication in DiVA (n/a for student publ.)
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