PSAS'2024 - International Conference on Precision Physics of Simple Atomic Systems

Session

Session 6

12 Jun 2024, 14:15

ETH Zurich- Hönggerberg Campus

Conveners

Session 6

• Daniel Kienzler

Session 6

• Daniel Kienzler

59. A new frontier in fundamental physics: precision vibrational spectroscopy of H${}_2^{+}$

Soroosh Alighanbari (Institut für Experimentalphysik, Heinrich-Heine-Universität Düsseldorf)

12/06/2024, 14:15

Talk

Molecular hydrogen ions (MHIs) represent a class of bound quantum systems with significant potential for advancing our knowledge in multiple scientific domains, including the determination of fundamental constants, test of quantum physics, and the search for new interparticle forces. Furthermore, the comparison of transitions in MHIs and their antimatter counterparts provides an opportunity...

71. Molecular hydrogen ion spectroscopy: prospects for determination of fundamental constants and for theory improvements

Jean-Philippe Karr (Laboratoire Kastler Brossel (FR))

12/06/2024, 14:40

Talk

Precision spectroscopy of rovibrational transitions in the HD${}^{+}$ molecular ion has made significant progress in the past few years, allowing to improve the determination of the proton-electron mass ratio as well as beyond-standard-model physics constraints. In this talk, a few directions for future advances will be discussed, both from an experimental and theoretical point of view.
Firstly,...

42. Quantum Logic Spectroscopy of the Hydrogen Molecular Ion

David Holzapfel

12/06/2024, 15:05

Talk

I will present our latest results, implementing pure quantum state preparation, coherent manipulation, and non-destructive state readout of the hydrogen molecular ion $H_2^{+}$. The hydrogen molecular ion $H_2^{+}$ is the simplest stable molecule, and its structure can be calculated ab-initio to high precision. However, challenging properties such as high reactivity, low mass, and the absence of...

18. Spin-Rovibrational Structure of the Molecular Hydrogen Ion from Spectroscopy of Rydberg States

Ioana Doran (ETH Zurich)

12/06/2024, 15:30

Talk

Precision measurements of rovibrational energies in H${}_2^{+}$ provide access to fundamental constants such as the proton-to-electron mass ratio or the proton charge radius, by comparison with theoretical results [1]. Because H${}_2^{+}$ and D${}_2^{+}$ are nonpolar, pure rotational and vibrational transitions are forbidden in the electric-dipole approximation and are very difficult to measure. As...

41. Rovibrational energy levels of the hydrogen molecule and its isotopologues from relativistic nonadiabatic calculations

Jacek Komasa (Adam Mickiewicz University in Poznań, Poland)

12/06/2024, 16:30

Talk

The energy of a molecular rovibrational level is theoretically derived from several components, including nonrelativistic, relativistic, quantum electrodynamics, and more. When it comes to a light molecule such as hydrogen or its isotopologue, the nonrelativistic quantum electrodynamics (NRQED) can accurately describe this energy using an expansion in powers of the fine structure constant...

66. Stringent tests of ab initio QED calculations in the ALPHATRAP experiment

Jonathan Morgner (Max-Planck-Institut für Kernphysik, Heidelberg)

12/06/2024, 16:55

Talk

Quantum electrodynamics (QED) is tested with great precision in small fields by the electron $g-2$ measurement [1]. Studying effects as self-energy and vacuum polarization is still of utmost importance due to some unsolved puzzles, as in example the discrepancy in the muon $g-2$ value. Thus, providing better tests of the theory in extreme cases is part of ongoing research. Highly charged ions...

38. Cavity-enhanced spectroscopy of ${\mathbf{H}}_{\mathbf{2}}$ in a deep cryogenic regime

Kamil Stankiewicz (Nicolaus Copernicus University)

12/06/2024, 17:20

Talk

We introduce, for the first time, a spectrometer based on a high-finesse optical resonator operating in a deep cryogenic regime, i. e., below 5 K. This system enables uniform cooling of the entire optical cavity, including the gas sample, the mirrors as well as the piezoelectric actuator (with tunability range exceeding 20 μm [1]). The setup is designed in a way that efficiently attenuates...