Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 63: Precision Spectroscopy of Atoms and Ions V (joint session A/Q)
Q 63.5: Talk
Thursday, March 5, 2026, 15:30–15:45, N 3
High-Precision Spectroscopy of Single Molecular Hydrogen Ions in a Penning Trap at ALPHATRAP — •P. Justus1, M. Bohman1, A. Gramberg1, F. Heisse1, I. Kortunov2, V. Vogt2, C. König1, K. Blaum1, S. Schiller2, and S. Sturm1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Institut für Experimentalphysik, Universität Düsseldorf, Düsseldorf
Molecular hydrogen ions are the simplest molecules and thus ideal systems for testing QED through comparison of high-precision measurements with theoretical predictions [1]. At ALPHATRAP we measured for the ro-vibrational ground state of HD+ the bound-electron g-factor to 0.20 ppb precision and the spin-interaction coefficients with 44 ppb and 151 ppb uncertainty [2], which can be compared to ab initio theory [3]. In a next step, we carried out high-precision laser spectroscopy of ro-vibrational levels via driving the 0 → 5 vibrational transition in HD+.
We will present conclusions drawn from our measurements and planned refinements that will, in the future, provide a versatile platform for ultra-high precision laser spectroscopy - particularly of molecular hydrogen ions, including H2+ and the antimatter equivalent H2− - in a cryogenic Penning trap [4].
[1] Karr, J.-Ph. et al., Phys. Rev. A 94, 050501 (2016)
[2] König, C. M. et al., Phys. Rev. Lett., 134, 163001 (2025)
[3] Karr, J.-Ph. et al., Phys. Rev. A 102, 052827 (2020)
[4] Myers, E. G., Phys. Rev. A, 98, 010101 (2018)
Keywords: MHI, Hyperfine Structure, Laser Spectroscopy, QED