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 …

Electron beam ion traps (EBITs) are ideal tools for both production and study of highly
charged ions (HCIs). In order to reduce their construction, maintenance, and operation costs …

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 …

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 …

Promising searches for new physics beyond the current standard model (SM) of particle
physics are feasible through isotope-shift spectroscopy, which is sensitive to a hypothetical …

We measure optical spectra of Nd-like W, Re, Os, Ir, and Pt ions of particular interest for
studies of a possibly varying fine-structure constant. Exploiting characteristic energy scalings …