Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 27: Precision Spectroscopy of Atoms and Ions III (joint session A/Q)
A 27.3: Talk
Thursday, March 14, 2024, 11:30–11:45, HS 1010
Hyperfine Spectroscopy of Single Molecular Hydrogen Ions in a Penning Trap at Alphatrap — •C. M. König1, M. Bohman1, V. Hahn1, F. Heiße1, I. V. Kortunov2, A. Kulangara Thottungal George1, J. Morgner1, F. Raab1, T. Sailer1, K. Singh1, B. Tu1,3, V. Vogt2, K. Blaum1, S. Schiller2, and S. Sturm1 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg — 2Institut für Experimentalphysik, Univ. Düsseldorf, 40225 — 3Institute of Modern Physics, Fudan University, Shanghai 200433
Molecular hydrogen ions (MHI) are a simple system allowing the comparison of high-precision measurements to state-of-the-art QED theory, testing the validity of the latter. At Alphatrap [1], we can isolate and confine a single MHI for months and perform high-precision spectroscopy using non-destructive quantum state detection.
I will present the results of hyperfine structure measurements on a single HD+ ion. From these, the bound g factor of the constituent particles, as well as coefficients of the hyperfine Hamiltonian can be extracted. The latter are important for a better understanding of rovibrational spectroscopy performed on this ion, from which fundamental constants, such as mp/me are determined to highest precision [2].
We are currently upgrading our trap for single-ion rovibrational laser spectroscopy of MHI. The development of these techniques is one of the required steps towards spectroscopy of an antimatter H2− ion [3].
[1] S. Sturm et al., Eur. Phys. J. Spec. Top. 227, 1425*1491 (2019)
[2] I. V. Kortunov, et al., Nature Physics vol 17, 569*573 (2021)
[3] E. Myers, Phys. Rev. A 98, 010101(R) (2018)
Keywords: Penning trap; molecular hydrogen ion; hyperfine; single ion; spectroscopy