Theoretical and experimental lifetime and oscillator strength determination in singly ionized neodymium (Nd ii) |
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| Authors: | H L Xu S Svanberg R D Cowan P-H Lefèbvre P Quinet E Biémont |
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| Institution: | Department of Physics, Lund Institute of Technology, PO Box 118, S-221 00 Lund, Sweden;Los Alamos National Laboratory, Los Alamos, USA;IPNAS, Universitéde Liège, Sart Tilman B15, B-4000 Liège, Belgium;Astrophysique et Spectroscopie, Universitéde Mons-Hainaut, B-7000 Mons, Belgium |
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| Abstract: | Radiative lifetime measurements were performed with time-resolved laser-induced fluorescence techniques for 24 levels of Nd ii in the energy range 20 500–32 500 cm?1. For 17 levels, no previous experimental data exist. These results have allowed the testing of new theoretical calculations with the relativistic Hartree–Fock method taking configuration interactions and core-polarization effects into account, and a satisfying agreement has been found for this complex ion. A new set of calculated oscillator strengths, accurate within a few per cent for the strongest transitions, is presented for 107 lines of astrophysical interest appearing in the wavelength range 358.0–1100.0 nm. These results will be useful to evaluate abundance values of neodymium in chemically peculiar stars in relation with cosmochronology. |
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| Keywords: | atomic data atomic processes stars: chemically peculiar |
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