Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 26, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.263003
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Funding
- German Federal Ministry of Research [06MZ169I, 06LM236I, 05P09RDFN4, 05P12RDFN8, 05P15RDFN1]
- GSI
- Helmholtz Association
- European Union Horizon 2020 research and innovation programme [654002]
- European Commission [PCOFUND GA 2013 600382]
- Science and Technology Facilities Council [ST/P004598/1, ST/L005670/1] Funding Source: researchfish
- STFC [ST/L005670/1, ST/P004598/1] Funding Source: UKRI
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One of the most important atomic properties governing an element's chemical behavior is the energy required to remove its least-bound electron, referred to as the first ionization potential. For the heaviest elements, this fundamental quantity is strongly influenced by relativistic effects which lead to unique chemical properties. Laser spectroscopy on an atom-at-a-time scale was developed and applied to probe the optical spectrum of neutral nobelium near the ionization threshold. The first ionization potential of nobelium is determined here with a very high precision from the convergence of measured Rydberg series to be 6.626 21 +/- 0.000 05 eV. This work provides a stringent benchmark for state-of-the-art many-body atomic modeling that considers relativistic and quantum electrodynamic effects and paves the way for high-precision measurements of atomic properties of elements only available from heavy-ion accelerator facilities.
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