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

Session

Session 4

11 Jun 2024, 14:15

ETH Zurich- Hönggerberg Campus

Conveners

Session 4

• Frédéric Merkt (ETH Zurich)

Session 4

• Frédéric Merkt (ETH Zurich)

13. Precision measurements on the (2-0) quadrupole transitions in H₂

Wim Ubachs (VU University Amsterdam)

11/06/2024, 14:15

Talk

The hydrogen molecule and its isotopologues has become a favorable test bench in the advancement of quantum mechanics in the molecular domain. Comparison between experiment and theory signifies a test of quantum electrodynamics in bound systems and it may be used to probe physics beyond the Standard Model (1). After the focus had been on measurement of the dissociation and ionization energies...

63. Precise Spectroscopy of the Fundamental Vibrational Band in a Trapped Single Molecular Nitrogen Ion

Meissa Diouf

11/06/2024, 14:45

Talk

Precision spectroscopy of dipole-forbidden rotational and vibrational transitions in molecular ions presents a promising avenue for investigating fundamental physical theories, detecting variations in fundamental constants, and establishing new frequency standards. Until recently, achieving the necessary precision has been hindered by the lack of control over molecular ions at the quantum...

75. Accurate theoretical predictions of the rovibrational energy levels of the helium hydride ion

Michal Silkowski (Adam Mickiewicz University, Poznań, Poland)

11/06/2024, 15:10

Talk

We present current progress towards accurate theoretical determination of rovibrational energy levels of the helium hydride ion and its isotopologues belonging to its electronic ground state. With the inclusion of nonadiabatic, relativistic and quantum-electrodynamic corrections through Nonadiabatic Perturbation Theory, a theoretical precision better than a few MHz can be achieved. Such an...

106. Laser excitation of the low-energy nuclear transition in 229Th

Maksim Okhapkin (PTB)

11/06/2024, 16:05

Talk

We report the first direct laser excitation of the Th-229 nuclear transition in Th-doped CaF2 crystals using a tabletop tunable laser system. The Th:CaF2 crystals are grown at TU Wien with up to $5\times10^{18}$ cm$^{-3}$ Th-229 concentration, and a VUV laser system developed at PTB, that provides a spectral photon flux of more than $2 \times 10^4$ photons/(s Hz).
A resonance fluorescence...

46. Tabletop particle physics and cosmology with precision quantum-logic spectroscopy

David Leibrandt (UCLA)

11/06/2024, 16:40

Talk

The extreme precision and accuracy of state-of-the-art optical atomic clocks can be used to look for very small deviations from the predictions of the Standard Model, offering a tool to search for beyond Standard Model (BSM) physics complementary to particle accelerators. These searches are based on measuring the frequency ratio of two transitions that depend differently on interactions with...