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 Bastin² — ¹Institut 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 ⁵F₅^o 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 ⁵F₅^o) = 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)