SAMOP 2023 – wissenschaftliches Programm

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SYHC: Symposium Precision Physics with Highly Charged Ions

SYHC 2: Intersection of the Electron-Shell and Nuclear Degrees of Freedom

SYHC 2.1: Hauptvortrag

Montag, 6. März 2023, 17:00–17:30, E415

Observation of metastable electronic states in highly charged ions by Penning-trap mass spectrometry — •Kathrin Kromer¹, Menno Door¹, Pavel Filianin¹, Zoltán Harman¹, Jost Herkenhoff¹, Paul Indelicato², Christoph H. Keitel¹, Daniel Lange¹, Chunhai Lyu¹, Yuri N. Novikov¹, Christoph Schweiger¹, Sergey Eliseev¹, and Klaus Blaum¹ — ¹Max-Planck-Institut für Kernphysik, 69117 Heidelberg, — ²Laboratoire Kastler Brossel, Sorbonne Université, CNRS, Paris, France

The vast landscape of transitions in highly charged ions including transitions in the optical and the extreme ultraviolet (XUV) regime offer up the opportunity for next generation clock research. Thanks to the rapid advances in the development of frequency combs, the XUV spectral range has become accessible for spectroscopy. However, the search for suitable clock transitions, e.g. involving long-lived metastable electronic states, usually relies heavily on complicated atomic structure calculations. With the mass spectrometer Pentatrap, we have found a new way to measure metastable state energies without actively driving the transition and therefore being independent of theoretical predictions. We use the metastable states populated during the ion production inside an electron beam ion trap (EBIT) and measure their mass difference to the ground state in a Penning-trap mass spectrometer. With this method we have detected a metastable state in lead and measured its energy as a mass difference of just 30.X(0.6) eV on top of the mass of the lead nuclei of ≈194 GeV, making it the most precise mass determination to date with a relative uncertainty of 3× 10⁻¹².