Conveners
Session 3
- Eberhard Widmann (Austrian Academy of Sciences (AT))
Session 3
- Eberhard Widmann (Austrian Academy of Sciences (AT))
We will present the current status of QED theory for hyperfine structure in hydrogenlike and heliumlike atoms in comparison to precision experimental results. For $^3$He$^+$ we use this comparison to obtain the nuclear polarizability effect. In the case of $^3$He atom we derive theoretical result for $2^3S$ hyperfine splitting with uncertainty of 41 Hz and observe excellent agreement with the...
A general quantum electrodynamic method is presented, that allows to derive nuclear recoil corrections in hydrogenic systems, which are exact in the nuclear charge parameter $Z\,\alpha$. The exemplary derivation is demonstrated for the $O(m/M)$ nonradiative nuclear recoil correction to the hyperfine splitting.
Results on calculations of bound state energy levels from trace anomaly will be presented.
The metastable He ((1s)$^1$(2s)$^1$) atom in its singlet ($^1$S$_0$) or triplet ($^3$S$_1$) states is an ideal system to perform tests of ab-initio calculations of two-electron systems that include quantum-electrodynamics and nuclear finite-size effects. The recent determination of the ionization energy of the metastable $2\,^1$S$_0$ state of $^4$He [1] confirmed a discrepancy between the...
Bound-state quantum electrodynamics (QED) accurately describes the energy levels of hydrogen-like atoms and ions. High-precision laser spectroscopy experiments provide one of the best tests of the theory. The frequency of the narrow 1s-2s transition of atomic hydrogen has been measured with a relative uncertainty of less than $10^{-14}$. By combining two spectroscopic measurements of a...
The spectroscopic investigation of the hydrogen molecule and its isotopologues is playing a crucial role in the advancement of quantum mechanics in the molecular domain. Particularly, highly accurate measurements of rovibrational transitions allow for various tests of fundamental physics including searches for physics beyond the Standard Model.
To carry these investigations on the...
