Recent developments in frequency metrology and optical clocks have been based on
electronic transitions in atoms and singly charged ions as references. The control over all …

Optical atomic clocks are the most accurate measurement devices ever constructed and
have found many applications in fundamental science and technology,–. The use of highly …

Nuclear ground state properties including mass, charge radii, spins and moments can be
determined by applying atomic physics techniques such as Penning-trap based mass …

Optical frequency metrology in atoms and ions can probe hypothetical fifth forces between
electrons and neutrons by sensing minute perturbations of the electronic wave function …

Control over the motional degrees of freedom of atoms, ions, and molecules in a field-free
environment enables unrivalled measurement accuracies but has yet to be applied to highly …

The magnetic moment μ of a bound electron, generally expressed by the g-factor μ=− g μ B s
ħ− 1 with μ B the Bohr magneton and s the electron's spin, can be calculated by bound-state …

Highly charged ions (HCIs) constitute a large class of atomic systems since each element
has as many ionization states as it has protons—in a sense, this extends the periodic table …

The energy levels and observed spectral lines of ionized argon atoms, in all stages of
ionization, have been compiled. Sufficient experimental data were found to generate level …

We report on the successful demonstration of a novel scheme for detecting optical
transitions in highly charged ions. We applied it to determine the frequency of the dipole …

Hyperfine structures of highly charged ions (HCIs) are favourable spectroscopic targets for
exploring fundamental physics along with nuclear properties. Recent proposals of HCI …