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Hannover 2010 – scientific programme

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A: Fachverband Atomphysik

A 25: Precision Spectroscopy of Atoms and Ions III

A 25.6: Talk

Friday, March 12, 2010, 11:45–12:00, F 107

Isotope shifts and hyperfine structure of the Fe I 372 nm resonance line — •Steffen Oppel1, Stefanie Krins2, Nicolas Huet2, Joachim von Zanthier1, and Thierry Bastin21Institut für Optik, Information und Photonik, Universität Erlangen-Nürnberg, Germany — 2Institut de Physique Nucléaire, Atomique et de Spectroscopie, Université de Liège, Belgium

We report measurements of the isotope shifts of the 3d64s2 a 5D4 - 3d64s4p z 5F5o Fe I resonance line at 372 nm between all four stable isotopes 54Fe, 56Fe, 57Fe, and 58Fe, as well as the complete hyperfine structure of that line for 57Fe, the only stable isotope having a non-zero nuclear spin. The field and specific mass shift coefficients of the transition have been derived from the data, as well as the experimental value for the hyperfine structure magnetic dipole coupling constant A of the excited state of the transition in 57Fe : A(3d64s4p z 5F5o) = 81.69(86) MHz. The measurements were carried out by means of high-resolution Doppler-free laser saturated absorption spectroscopy in a Fe-Ar hollow cathode discharge cell using both natural and enriched iron samples. The measured isotope shifts and hyperfine constants are reported with uncertainties at the percent level [1].

[1] S. Krins, S. Oppel, N. Huet, J. von Zanthier, and T. Bastin, Phys. Rev. A 80, 062508 (2009)

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