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 …

High-resolution laser spectroscopy is an established powerful tool in the study of nuclear
shape, size and multipole moments. Measurements of the hyperfine structures and isotope …

Collinear laser spectroscopy is performed on the nickel isotopes Ni 58-68, 70, using a time-
resolved photon counting system. From the measured isotope shifts, nuclear charge radii R …

The exploration of the unique properties of stored and cooled beams of highly-charged ions
as provided by heavy-ion storage rings has opened novel and fascinating research …

Storage rings have been employed over three decades in various kinds of nuclear and
atomic physics experiments with highly charged ions. Storage ring operation and precision …

Electrons bound in highly charged heavy ions such as hydrogen-like bismuth 209Bi82+
experience electromagnetic fields that are a million times stronger than in light atoms …

The current status of bound state quantum electrodynamics calculations of transition
energies for few-electron ions is reviewed. Evaluation of one and two body QED correction …

A recent measurement of the hyperfine splitting in the ground state of Li-like Bi 208 80+ has
established a “hyperfine puzzle”—the experimental result exhibits a 7 σ deviation from the …

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 …

In the last two and a half decades ion storage rings have proven to be powerful tools for
precision experiments with unstable nuclides in the realm of nuclear structure and …