International Conference on Precision Physics of Simple Atomic Systems

Session

Session 16

21 May 2026, 16:10

Festsaal, Theatersaal (ÖAW)

65. Precision Spectroscopy of Single HD$^{+}$ Ions in a Penning Trap

Matthew Bohman (Max-Planck-Institut für Kernphysik)

21/05/2026, 16:10

Talk

Diatomic molecular hydrogen ions (MHI) such as H$_2^+$ and HD$^{+}$ are simple, single-electron systems with properties that can be calculated to high precision by ab initio theory. Comparison to precision experiments then enables stringent tests of the Standard Model and high-precision determinations of fundamental constants. Laser spectrosocopy of rovibrational transitions has now been...

67. Nonrelativistic and relativistic QED calculations in molecular hydrogen ions

Dr Jean-Philippe Karr (Laboratoire Kastler Brossel)

21/05/2026, 16:40

Talk

In the last few years, spectroscopy of molecular hydrogen ions (MHI) contributed for the first time in the adjustment of fundamental constants and in establishing bounds on beyond-standard-model interactions. Ongoing improvements and diversification of experimental methods require advancing further the theoretical description of MHIs. One way in which this may be achieved consists in combining...

11. Towards all-order self-energy computations in hydrogen molecular ions

David Ferenc (CNRS)

21/05/2026, 17:00

Talk

The largest source of uncertainty in the theory of spin-averaged rovibrational transitions in hydrogen molecular ions arises from uncalculated higher-order ($m\alpha^{8+}$) corrections to the one-loop self-energy [1]. These terms are extremely challenging to evaluate via the standard $Z\alpha$ expansion, therefore—similarly to the case of the hydrogen atom [2]—a numerical all-order approach is...

55. Molecular deceleration via vibrational coherent bichromatic Force

Meng-yi Yu (University of Science and Technology of China)

21/05/2026, 17:20

Talk

Cold molecules exhibit significant potential in many applications, including precision measurement, quantum metrology, and fundamental physics. Although a few specific types of molecules have been successfully laser-cooled by selecting electronic transitions with appropriate Franck-Condon factors, laser deceleration of general molecules still poses significant challenges. In order to explore...