Conveners
Session 3
- Eberhard Widmann (Austrian Academy of Sciences (AT))
Session 3
- Eberhard Widmann (Austrian Academy of Sciences (AT))
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Dr Vojtěch Patkóš (Charles University)11/06/2024, 09:00Talk
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...
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Prof. Krzysztof Pachucki11/06/2024, 09:25Talk
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.
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Prof. Michael Eides (University of Kentucky)11/06/2024, 09:50Talk
Results on calculations of bound state energy levels from trace anomaly will be presented.
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Dr Yu Sun11/06/2024, 10:50Talk
Precision spectroscopy in few-body atomic systems, like hydrogen and helium, enables the testing of the quantum electro-dynamics (QED) theory and determination of the fundamental physical constants, such as the Rydberg constant, the proton charge radius, and the fine-structure constant. It also sets constraints on new physics beyond the standard Model (BSM). High precision spectroscopy of...
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Gloria Clausen (ETH Zürich)11/06/2024, 11:15Talk
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...
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Florian Egli (Max Planck Institute of Quantum Optics)11/06/2024, 11:40Talk
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...
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Valentin Hermann (IAP/TLK)11/06/2024, 12:00Talk
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.
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To carry these investigations on the...