Using the relativistic coupled-cluster method, we have calculated ionization potentials,
electric dipole transition amplitudes, and dipole polarizabilities of many low-lying states of …

As an important step toward an atomic parity violation experiment in one single trapped Ra+
ion, laser spectroscopy on short-lived Ra 212, 213, 214+ ions was conducted. The isotope …

The electric quadrupole moments of the metastable nd 3∕ 2 and nd 5∕ 2 states of Ca+,
Sr+, and Ba+ are calculated using the relativistic all-order method including all single …

This thesis reports on experiments with trapped 40Ca+ ions related to the field of precision
spectroscopy and quantum information processing. For the absolute frequency …

High accuracy frequency metrology on the 4 s S 1∕ 2 2–4 p P 1∕ 2 2 transition in calcium
ions is performed using laser cooled and crystallized ions in a linear Paul trap. Calibration is …

Atomic parity violation (APV) experiments are sensitive probes of the electroweak interaction
at low energy. These experiments are competitive with and complementary to high-energy …

The hyperfine structure of the 4 s S 1∕ 2 2-3 d S 5∕ 2 2 quadrupole transition at 729 nm in
Ca+ 43 has been investigated by laser spectroscopy using a single trapped Ca+ 43 ion. We …

Precision measurement of the 4s 2 S 1/2–3d 2 D 5/2 clock transition based on 40 Ca+ ion at
729 nm is reported. A single 40 Ca+ ion is trapped and laser-cooled in a ring Paul trap, and …

We have performed ab-initio calculations to investigate the van der Waals interaction
between a Ca+ ion and a helium atom. We have focused on determining the low-lying …

A single laser-cooled ion confined in a radiofrequency ion trap comes close to the
spectroscopic ideal of an absorber at rest in a perturbation-free environment. Narrow optical …