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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)

Q 27.1: Poster

Tuesday, March 3, 2026, 17:00–19:00, Philo 1. OG

Towards High Precision Laser Spectroscopy on a Cold Beam of Atomic Lithium — •Hannah Jost, Tim Redelbach, Gregor Schwendler, and Randolf Pohl — Institut für Physik/ QUANTUM, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, 55128 Mainz, Germany

Precision measurements of simple atoms and molecules are useful because comparison with equally precise theory calculations can test the theory and determine fundamental physical constants [1]. We are aiming at new precision measurements of the lithium D lines, for the first time using a cold atomic beam obtained from a 2D-MOT [2], and using an actively stabilised retroreflector [3, 4] to eliminate the first order Doppler shift. Comparison with ongoing experiments on muonic lithium [5] will in addition enable stringent tests of a variety of systematics relevant for recent and ongoing experiments in atomic hydrogen and deuterium [6], such as Quantum Interference [7], or the light-force shift [6].

[1] P. Mohr et al., arXiv 2409.03787 (2024). [2] T. Tiecke et al., Phys. Rev. A 80 1094-1622 (2009). [3] V. Wirthl et al., Optics Express 29, 7024 (2021). [4] V. Wirthl et al., Optics Express 30, 7340 (2022). [5] B. Ohayon et al., Physics 6, 206-215 (2024). [6] A. Beyer et al., Science 358, 6359 (2017). [7] T. Udem et al., Annalen der Physik 531, 1900044 (2019).

Keywords: Precision Laser Spectroscopy; Cold Atoms