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Q: Fachverband Quantenoptik und Photonik

Q 25: Precision Spectroscopy of Atoms and Ions II (joint session A/Q)

Q 25.8: Vortrag

Mittwoch, 13. März 2024, 12:45–13:00, HS 1098

Ionization potential evaluation by Rydberg analysis in iron with resonance ionization spectroscopy — •Thorben Niemeyer¹, Sebastian Berndt¹, Christoph E. Düllmann^1,2,3, Tom Kieck^2,3, Jung-Bog Kim⁴, Nina Kneip⁵, Dominik Studer¹, and Klaus Wendt¹ — ¹Johannes-Gutenberg-Universität, Mainz — ²GSI Zentrum für Schwerionenforschung, Darmstadt — ³Helmholtz-Institut, Mainz — ⁴Korea National University of Education, Cheongju — ⁵Leibniz Universität, Hannover

The energetic position of high-lying Rydberg levels and their convergence limit, defining the ionization potential (IP), are characteristic properties for every element and give insights into its specific atomic structure. As a well suited technique, Resonance Ionisation Mass Spectrometry was applied to develop a new two-step ionization scheme in the atomic spectrum of iron using ti:sa lasers, involving frequency doubling and trippling. Literature data is complemented by numerous newly found even parity Rydberg levels. The IP, obtained through the Rydberg-Ritz formalism, is in perfect agreement with the literature value, which was obtained by three-step resonance ionization with similar precision. This confirms the independence of the IP from parity. A number of Rydberg series above the IP converging to higher-lying continua of the Fe ion were measured and analysed.

The set of data provides the basis for applying RIMS to the EU PrimA-LTD project, for which radioactive Fe-55 ions are implanted into metallic magnetic microcalorimeters for precision studies on the electron-capture decay of this isotope.

Keywords: Iron; Ionisation potential; Rydberg; Implantation