We present the measurements of individual bound electron g factors of Ne 20 9+ and Ne 22
9+ on the relative level of 0.1 parts per billion. The comparison with theory represents the …

A model-operator approach to fully relativistic calculations of the nuclear recoil effect on
energy levels in many-electron atomic systems is worked out. The one-electron part of the …

The nuclear-polarization corrections to the energy levels of highly charged ions are
systematically investigated to leading order in the fine-structure constant. To this end, the …

The leading-order contribution of a new boson to the muonic fine-structure anomaly, which
refers to a discrepancy between the predicted transition energies and spectroscopic …

With the increasing precision of spectroscopic measurements, there is a growing demand for
more accurate theoretical predictions, which requires the estimation of various higher-order …

We report on precision spectroscopy of the 6 s 2 S 0 1→ 6 s 6 p P 1 3 intercombination line
of mercury in the deep ultraviolet, by means of a frequency-comb referenced, wavelength …

We present the systematic QED treatment of the electron correlation effects on the g factor of
lithiumlike ions for the wide range of nuclear charge number Z= 14–82. The one-and two …

The finite nuclear size corrections to the ground state energies and g-factors in muonic
atoms are investigated for several elements. Both approximative and exact solutions of the …

Optical atomic clocks are the most precise and accurate measurement devices, reaching
fractional systematic uncertainties below one part in 10− 18. Their exceptional performance …

We present the measurements of individual bound electron $ g $ factors of $^{20}\text
{Ne}^{9+} $ and $^{22}\text {Ne}^{9+} $ on the relative level of $0.1\,\text {parts} $ per billion …