Lifetime measurements in Ru II and calculated oscillator strengths in Ru II and Ru III

• Published in: Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2009-08, Vol.42 (16), p.165005-165005 (12)
• Main Authors: Palmeri, P, Quinet, P, Fivet, V, Biémont, É, Cowley, C R, Engström, L, Lundberg, H, Hartman, H, Nilsson, H
• Format: Article
• Language: English
• Subjects: Astronomi, astrofysik och kosmologi; Astronomy, Astrophysics and Cosmology; Atom and Molecular Physics and Optics; Atom- och molekylfysik och optik; Atomic and molecular physics; Atomic properties and interactions with photons; Exact sciences and technology; Fysik; Intensities and shapes of atomic spectral lines; Natural Sciences; Naturvetenskap; Oscillator strengths, lifetimes, transition moments; Physical Sciences; Physical, chemical, mathematical & earth Sciences; Physics; Physique; Physique, chimie, mathématiques & sciences de la terre
• ISSN: 0953-4075; 1361-6455; 1361-6455
• DOI: 10.1088/0953-4075/42/16/165005

A new set of theoretical f-values is reported for 178 Ru II transitions of astrophysical interest, involving energy levels below 58 000 cm-1. The theoretical model, including core-polarization effects, has been tested by comparing theoretical lifetimes with new measurements performed by time-resolved laser-induced fluorescence spectroscopy for 23 4d6(5D)5p odd levels of Ru II and by comparing theoretical and experimental Lande g-factors. The first set of transition probabilities is proposed for 25 strong lines depopulating the 4d55p5,7P deg terms of Ru III. The new results will allow quantitative investigations of stellar spectra and allow the astrophysicists to refine the ruthenium abundance in stars.