Abstract
Laser induced fluorescence spectroscopy has been applied to measure the hyperfine structure and isotope shift of osmium I spectral lines in the visible range. Precise values for the hyperfine structure constants A and B of the most abundant odd mass isotope 189Os and the level isotope shift of altogether 43 excited energy levels were determined evaluating the measurements. Osmium in its natural abundance as well as an enriched sample of 189Os were used during the experiments. Additionally, a parametric analysis of the fine structure, the hyperfine structure and the isotope shift has been performed for the three even configurations 5d66s2, 5d76s and 5d8. Finally, the nuclear electric quadrupole moment Q for the isotope 189Os is determined to Q(5d66s2 = 0.98 (8) b for the configuration 5d66s2 and Q(5d76s = 0.97 (9) b for the configuration 5d76s.
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