Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 25: Precision Spectroscopy of Atoms and Ions II (joint session A/Q)

Q 25.7: Vortrag

Dienstag, 3. März 2026, 12:45–13:00, N 3

Cold Hydrogen Beam Source for Magnetic Trapping of Atomic Hydrogen — •Merten Heppener and Randolf Pohl — Johannes Gutenberg-Universität Mainz, QUANTUM, Institut für Physik & Exzellenzcluster PRISMA++ , Mainz, Germany

We are currently setting up an experiment to determine the root-mean-square triton charge radius via two-photon 1S-2S laser spectroscopy at 243 nm on magnetically trapped tritium atoms [1]. For preparation of trapping, a cold atomic hydrogen source consisting of a microwave discharge and a cryogenic nozzle was set up. The atom beam was characterized using time-of-flight techniques, the results of which we will present here. A velocity filter in form of a magnetic quadrupole guide will be installed shortly to further reduce the beam velocity. After achieving a stable atomic hydrogen beam, the 243 nm laser system and enhancement cavity will be integrated into the vacuum apparatus to probe the 1S-2S two-photon transition. In the future, it is planned to load the slow hydrogen atoms into a magnetic minimum trap using a cold lithium buffer gas.

[1] S. Schmidt et al. J. Phys.: Conf. Ser. 1138, 012010 (2018)

Keywords: Cold atom beam; Hydrogen spectroscopy; Time of flight measurement