The extremely precise extraction of the proton radius obtained by Pohl et al. from the
measured energy difference between the 2 P and 2 S states of muonic hydrogen disagrees …

Precise proton and neutron form factor measurements at Jefferson Lab, using spin
observables, have recently made a significant contribution to the unraveling of the internal …

Helium-3 has nowadays become one of the most important candidates for studies in
fundamental physics,–, nuclear and atomic structure,, magnetometry and metrology, as well …

Highly accurate results from frequency measurements on neutral hydrogen molecules H 2,
HD, and D 2 as well as the HD+ ion can be interpreted in terms of constraints on possible …

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 …

Experimental work on cold, trapped metastable noble gases is reviewed. The aspects which
distinguish work with these atoms from the large body of work on cold, trapped atoms in …

We critically examine the current status of theoretical calculations of the energies, the fine
structure, and the isotope shift of the lowest-lying states of helium, searching for unresolved …

In connection with recent and proposed experiments, and new theoretical results, my
previous calculations of the Lamb shift in muonic hydrogen will be reviewed and compared …

In a recent breakthrough in first-principles calculations of two-electron systems, Patkóś,
Yerokhin, and Pachucki [Phys. Rev. A 103, 042809 (2021) PLRAAN 2469-9926 …

The neutron-rich He 6 and He 8 isotopes exhibit an exotic nuclear structure that consists of a
tightly bound He 4-like core with additional neutrons orbiting at a relatively large distance …