Freiburg 2024 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 6: Ultracold Molecules and Precision Spectroscopy (joint session MO/Q)
MO 6.5: Vortrag
Dienstag, 12. März 2024, 12:00–12:15, HS 3044
Frequency metrology system for spectroscopy of molecular hydrogen ions in ALPHATRAP — •V. Vogt1, I.V. Kortunov1, K. Singh2, A. Kulangara Thottungal George2, B. Tu2,3, C.M. König2, F. Raab2, J. Morgner2, T. Sailer2, V. Hahn2, F. Heisse2, M. Bohman2, K. Blaum2, S. Sturm2, and S. Schiller1 — 1Institut für Experimentalphysik, Univ. Düsseldorf, 40225 Düsseldorf — 2Max-Planck-Institut für Kernphysik, 69117 Heidelberg — 3Institute of Modern Physics, Fudan University, Shanghai 200433
At MPIK, an experiment is in preparation aiming at ultra-high precision vibrational spectroscopy of single molecules H2+ and HD+ in the Penning-trap apparatus ALPHATRAP. We require laser light at 1.1 µm and 5.48 µm, respectively, with linewidth 10 Hz, instability below 1 Hz, and absolute frequency measurement capability with uncertainty below 10−13. In addition the laser light must be available 24/7, tunable and switchable under computer control so as to implement appropriate molecule interrogation schemes. We have developed a laser system, similar to [1,2], consisting of spectroscopy laser, reference cavity, transfer laser, frequency comb, hydrogen maser and GNSS receiver at the U. Düsseldorf and transferred it to MPIK, where it has been put into operation again and refined. To transport the spectroscopy light to the Penning-trap, optical fibers with path length cancellation will be implemented. We report the current performance of the system and discuss whether it satisfies the requirements of the experiment.
[1] I. V. Kortunov et al., Nat. Phys. 17, 569 (2021)
[2] S. Alighanbari et al., Nat. Phys. 19, 1263 (2023)
Keywords: molecular hydrogen ions; laser spectroscopy; Penning traps