Mainz 2026 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 29: Precision Spectroscopy of Atoms and Ions IV (joint session A/Q)

A 29.4: Vortrag

Donnerstag, 5. März 2026, 12:00–12:15, N 3

High-resolution laser spectroscopy on iron — •Katrin Weidner¹, Thorben Niemeyer¹, Jakob Weiss¹, Sebastian Berndt¹, Pia Breinbauer¹, Christoph E. Düllmann^1,2,3, Raphael Hasse¹, Dennis Renisch^1,2, Jörg Runke^1,2, Matou Stemmler¹, Dominik Studer², Sebastian Raeder², and Klaus Wendt¹ — ¹Johannes-Gutenber-Universität Mainz — ²Helmholtz-Institut Mainz — ³GSI Helmholtzzentrum für Schwerionenforschung Darmstadt

High-resolution laser spectroscopy on free atoms provides access to fundamental properties of the atomic and nuclear structure of matter. Iron is among the most abundant metals on Earth and also plays a major role in astronomical observations.

We present high resolution measurements on iron isotopes, addressing the first measurement on the hyperfine structure of the radioisotope ⁵⁵Fe . An efficient three-step ionization scheme is used for excitations with high-power tunable Titan:Sapphire lasers, including second harmonic generation. To investigate the hyperfine structure we explore injection locking with a commercial Optical Parametric Oscillator (OPO).

Keywords: iron; ionisation spectroscopy; hyperfine structure