Regular Article - Atomic Physics
Investigation of the atomic structure of curium and determination of its first ionization potential
Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany
2 Department Chemie - Standort TRIGA, Johannes Gutenberg Universität Mainz, 55099, Mainz, Germany
3 Helmholtz-Institut Mainz, 55099, Mainz, Germany
4 GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany
Accepted: 19 September 2022
Published online: 12 October 2022
We report on the investigation of the atomic structure of curium () by resonance ionization spectroscopy. Three different excited energy levels were populated from the ground state as first excitation steps. Wide-range scans were performed for the search of second excitation steps around the literature value of the ionization potential. These spectra were analyzed to identify Rydberg levels and auto-ionizing resonances. The ionization potential was consistently determined as 48330.68(16) through the evaluation of Rydberg convergences and the complementary approach of DC electric field ionization by evaluating the ionization threshold according to the saddle point model. The new result deviates by 6.7 from the literature value of 48324(2) by Köhler et al.  and is about one order of magnitude more precise.
© The Author(s) 2022
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