International Conference on Precision Physics of Simple Atomic Systems

Session

Session 11

20 May 2026, 14:00

Festsaal (ÖAW)

30. Tests of QED in molecular hydrogen

Wim Ubachs (VU University Amsterdam)

20/05/2026, 14:00

Talk

The hydrogen molecule (H$_2$), as the smallest molecule, is the benchmark system for testing quantum electrodynamics calculations in molecular systems. In particular the values of the dissociation and ionization energies, linked to each other via a thermodynamic cycle, have been a target to compare theory with the most advanced experiments. Since the advent of quantum mechanics many orders of...

36. Cavity-enhanced spectroscopy in the deep cryogenic regime new hydrogen technologies for quantum sensing

Mr Dariusz Kierski (Nicolaus Copernicus University in Torun, Poland)

20/05/2026, 14:30

Talk

We demonstrate the first cavity-enhanced spectrometer fully operating in a deep cryogenic regime down to 4 K. Not only the sample but the entire cavity, including the mirrors and cavity length actuator [1], is uniformly cooled down ensuring the thermodynamic equilibrium of the gas sample. The setup is designed in a way that efficiently attenuates both external vibrations and those originating...

20. Towards optical trapping of hydrogen molecules

Piotr Wcislo (Nicolaus Copernicus University in Torun)

20/05/2026, 15:00

Talk

Due to its simplicity, H$_2$ constitutes a perfect tool for testing fundamental physics: testing quantum electrodynamics, determining fundamental constants, or searching for new physics beyond the Standard Model. H$_2$ has a huge advantage over the other simple calculable systems of having a set of a few hundred ultralong living rovibrational states, which implies the ultimate limit for...

26. QED in finite Gaussian basis sets

Trond Saue (Laboratoire de Chimie et Physique Quantiques, UMR 5626 CNRS/Université de Toulouse)

20/05/2026, 15:20

Talk

The [HAMP-vQED][1] project, funded by an ERC advanced grant, aims to set new standards for highly accurate calculations of molecular properties. This includes exploring the possible role of QED-effects on properties that explore the electronic density in the vicinity of nuclei, such as the parameters of NMR and Mössbauer spectroscopies. A first line of attack has been the inclusion of...