Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)
Q 27.25: Poster
Tuesday, March 3, 2026, 17:00–19:00, Philo 1. OG
Characterising Atomic Hydrogen beam for precision spectroscopic experiment — •Surabhi Deshpande1,2, Derya Taray1, Vincent Weis1, Patrick Schaile1, Alexander Wilzewski1, Omer Amit1, Vitaly Wirthl1, Theodor W. Hänsch1,2, and Thomas Udem1,2 — 1Max Planck Institute for Quantum Optics (MPQ), Garching, Germany — 2Department of Physics, Ludwig-Maximilians-Universität, Munich, Germany
Precision Spectroscopy of atomic hydrogen is a promising approach for measuring fundamental constants and testing QED due to the very simple structure of the atom. One of the most vital demands for such experiments is a stable source of atomic hydrogen and a method of precisely quantifying the atomic hydrogen population. In this poster, I will give an overview of the methods I attempted to characterise our atomic hydrogen beam in the 1S-3S Direct Frequency Comb Spectroscopy Experiment at MPQ. This includes Optical Emission Spectroscopy of the hydrogen plasma used to dissociate molecular hydrogen to atomic hydrogen, to compare optical emissions of atomic and molecular hydrogen, i.e., Balmer lines and Fulcher bands. In addition, a Calorimetric Wire Detector is being developed for in situ detection of atomic hydrogen. It is based on the resistance change of a very thin wire due to the heat released from the recombination of atomic hydrogen on its surface. I will present preliminary results from the Calorimetric Wire Detector for qualitative detection of atomic hydrogen.
Keywords: Precision Spectroscopy; Plasma Spectroscopy; Atomic hydrogen; Fulcher and Balmer emissions; Calorimetric Detector