Studying the violation of parity and time-reversal invariance in atomic systems has proven to
be a very effective means of testing the electroweak theory at low energy and searching for …

We propose a novel approach to probe new fundamental interactions using isotope shift
spectroscopy in atomic clock transitions. As a concrete toy example we focus on the Higgs …

Isotope shifts of transition frequencies in atoms constrain generic long-and intermediate-
range interactions. We focus on new physics scenarios that can be most strongly …

The very high precision of current measurements and theory predictions of spectral lines in
few-electron atoms allows us to efficiently probe the existence of exotic forces between …

We present a method for measuring branching fractions for the decay of J= 1/2 atomic
energy levels to lower-lying states based on time-resolved recording of the atom's …

Motivated by recent measurements for several alkali-metal atoms and alkali-metal-like ions,
we perform a detailed study of electric dipole (E 1) transition amplitudes in K, Ca+, Rb, Sr+ …

The neutron-rich radium isotopes, Ra 222− 233, were measured with Collinear Resonance
Ionization Spectroscopy (CRIS) at the ISOLDE facility, CERN. The hyperfine structure of the …

We report on our calculations of differential hyperfine anomalies in the nuclear single-
particle model for a number of atoms and ions of interest for precision atomic tests of the …

A single Ra+ ion stored in a Paul radio frequency ion trap has excellent potential for a
precision measurement of the electroweak mixing angle at low momentum transfer and as …

We carried out a systematic high-precision relativistic study of the forbidden magnetic dipole
and electric quadrupole transitions in Ca+, Rb, Sr+, Cs, Ba+, Fr, Ra+, Ac 2+, and Th 3+. This …