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physics.atom-ph2026
Spectroscopy of He at 0.25 ppt Uncertainty and Improved Alpha-Helion Charge-Radius Difference Determination
K. Steinebach, J. C. J. Koelemeij, H. L. Bethlem +1
High-precision spectroscopy of simple atomic systems can be used to advance the theory of atomic energy levels but can also serve as a sensitive probe of nuclear charge radii. For…
physics.atom-ph2018
Precision spectroscopy of helium in a magic wavelength optical dipole trap
R. J. Rengelink, Y. van der Werf, R. P. M. J. W. Notermans +4
Improvements in both theory and frequency metrology of few-electron systems such as hydrogen and helium have enabled increasingly sensitive tests of quantum electrodynamics (QED),…