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 …

We propose to install a storage ring at an ISOL-type radioactive beam facility for the first
time. Specifically, we intend to setup the heavy-ion, low-energy ring TSR at the HIE-ISOLDE …

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 …

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 …

Recent theoretical works have proposed atomic clocks based on narrow optical transitions
in highly charged ions. The most interesting candidates for searches of physics beyond the …

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 …

A compact electron beam ion trap (EBIT) has been constructed for spectroscopic studies of
moderate charge state ions. The electron beam energy range of the present EBIT is 100 …

We demonstrate resonant fluorescence laser spectroscopy in highly charged ions (HCI)
stored in an electron beam ion trap by investigating the dipole-forbidden 1 s 2 2 s 2 2 p P 3/2 …

We propose the use of trapped ions for the detection of millicharged dark matter.
Millicharged particles will scatter off the ions, giving a signal either in individual events or in …

For the hydrogenlike Ar 17+ ion, the 1 s Lamb shift was absolutely determined with a 1.4%
accuracy based on Lyman-α wavelength measurements that have negligible uncertainties …