Erlangen 2022 – scientific programme

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A: Fachverband Atomphysik

A 20: Precision spectroscopy of atoms and ions (joint session A/Q)

A 20.5: Poster

Wednesday, March 16, 2022, 16:30–18:30, P

Towards 1S-2S Spectroscopy in Atomic Tritium — •Hendrik Schürg, Merten Heppener, Jan Haack, Gregor Schwendler, and Randolf Pohl — Johannes Gutenberg-Universität Mainz, QUANTUM, Institut für Physik & Exzellenzcluster PRISMA⁺, Mainz, Germany

The study of the hydrogen-deuterium isotope shift for the 1S-2S transition successfully demonstrated access to a high-precision result for the root-mean-square charge radius of the deuteron [1, 2]. We are currently setting up an experiment to perform a complementing measurement of the hydrogen-tritium 1S-2S isotope shift on magnetically trapped cold tritium atoms – allowing for a 400-fold improvement of uncertainty for the triton charge radius [3]. For an intermediate result, we plan to perform 1S-2S spectroscopy on hot tritium atoms inside a discharge. The excitation can be monitored using the optogalvanic signal induced by a change of conductivity in the hot gas. The available high-precision result for the 1S-2S transition frequency in atomic hydrogen [4] will be used to determine systematic effects in our apparatus. We will present details about our laser system and preliminary measurements with atomic hydrogen.

[1] C. G. Parthey et al. Phys. Rev. Lett. 104, 233001 (2010)

[2] U. D. Jentschura et al. Phys. Rev. A 83, 042505 (2011)

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

[4] C. G. Parthey et al. Phys. Rev. Lett. 107, 203001 (2011)