SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 20: Poster II

A 20.7: Poster

Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof

Optogalvanic Spectroscopy of Atomic Hydrogen — •Hendrik Schürg, Merten Heppener, and Randolf Pohl — Johannes Gutenberg-Universität Mainz, Institut für Physik/QUANTUM & Exzellenzcluster PRISMA⁺, Mainz, Germany

Laser spectroscopy on atoms has proven to be a successful path to high-precision results for the root-mean-square charge radii of the lightest nuclei. Similar to studies on deuterium in a cyrogenic atomic beam [1,2], we propose to determine the triton charge radius by measuring the hydrogen-tritium 1S-2S isotope shift on thermal atoms in a sealed discharge cell – providing encapsulation of the radioactive tritium gas. The resonant excitation to the 2S state is intended to be monitored via the optogalvanic effect, corresponding to a laser-induced change of the plasma’s impedance. Optogalvanic spectroscopy at the hydrogen Balmer-β dipole transitions in a low-pressure microwave discharge is demonstrated as a pre-stage to two-photon 1S-2S spectroscopy. We present studies on systematic effects and control parameters of the plasma as well as an evaluation of optogalvanic detection methods.

[1] C. G. Parthey et al. Phys. Rev. Lett. 104, 233001 (2010)
[2] U. D. Jentschura et al. Phys. Rev. A 83, 042505 (2011)