A&A 382, 368-377 (2002)
DOI: 10.1051/0004-6361:20011597

Experimental oscillator strengths in Th II

H. Nilsson¹, Z. G. Zhang², H. Lundberg², S. Johansson¹ and B. Nordström<sup>1, 3

1</sup>  Atomic Astrophysics, Lund Observatory, Lund University, PO Box 43, 22100 Lund, Sweden
²  Atomic Physics, Department of Physics, Lund Institute of Technology, PO Box 118, 22100 Lund, Sweden
³  Niels Bohr Institute for Astronomy, Physics & Geophysics, Juliane Marie vej 30, 2100 Copenhagen, Denmark
    e-mail: zhang.zhiguo@fysik.lth.se; hans.lundberg@fysik.lth.se; sveneric.johansson@astro.lu.se; birgitta@astro.ku.dk

(Received 17 October 2001 / Accepted 5 November 2001)

Abstract
We have measured radiative lifetimes of ten Th II levels by using the laser-induced fluorescence technique and branching fractions with Fourier transform spectroscopy. By combining the new branching fractions with a total of 23 lifetimes, from the present work and from measurements by Simonsen et al. (1988), absolute oscillator strengths for 180 lines have been derived. Some of these new f-values reported are relevant for radioactive dating of stars.

Key words: atomic data -- stars: evolution -- Galaxy: evolution

Offprint request: H. Nilsson, hampus.nilsson@astro.lu.se

© ESO 2002

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