Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 19: Precision Spectroscopy of Atoms and Ions II (joint session A/Q)
A 19.8: Talk
Wednesday, March 13, 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. Düllmann1,2,3, Tom Kieck2,3, 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