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 …

Precision spectroscopy of atomic systems is an invaluable tool for the study of fundamental
interactions and symmetries. Recently, highly charged ions have been proposed to enable …

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 …

The majority of ions and other charged particles of spectroscopic interest lack the fast,
cycling transitions that are necessary for direct laser cooling. In most cases, they can still be …

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 …

Nuclear hyperfine mixing (NHM) is a distinctive effect through which nuclear properties and
dynamics can be efficiently controlled. Traditionally, the scientific consensus has …

The lifetime of the galliumlike Mo 11+ ion 4 s 2 4 p P 3/2 2 metastable level was measured at
an electron-beam ion trap. The lifetime was inferred from the temporal behavior of its …

Long-lived ionic quantum states known as metastable electronic states in highly charged
ions (HCIs) are of great interest in fundamental physics. Especially, it generates transitions …

We study various properties of the 2 p P 1/2 2− 2 p P 3/2 2 fine-structure splittings in the
boronlike S 11+, Cl 12+, Ar 13+, and K 14+ ions and the 4 p P 1/2 2− 4 p P 3/2 2 fine …

An accurate determination of various parameters of Ar 13+ is presented in this work. The
wave functions and energy levels of the low-lying states within the configurations of 2 s 2 2 p …