Precision Laser Spectroscopy of Single HD+ Ions in a Penning TrapHYBRID

Molecular hydrogen ions (MHI) such as H2+ and HD+ are simple, single-electron systems with properties that can be calculated to high precision by ab initio theory. Comparison to precision experiments then enables stringent tests of the Standard Model and high-precision determinations of fundamental constants. Laser spectroscopy of rovibrational transitions has now been demonstrated in both HD+ and in H2+ using strings of MHI trapped in Coulomb crystals of laser cooled Be+ ions while quantum state control of single ions has been achieved using quantum logic spectroscopy. Here, we present the results of a measurement campaign using single HD+ ions in the Alphatrap cryogenic Penning trap. The highly isolated cryogenic environment combined with image-current-based state-detection methods allows us to quickly prepare and detect ions in pure quantum states without the use of auxiliary ions. This, in turn, allowed us to perform a high-resolution determination of the ground state hyperfine structure including a comparison of the experimentally determined bound electron g-factor to a recent theoretical prediction with a relatively uncertainty of 2e-10. Recently, we have also performed laser spectroscopy of the (v,L) = (0,0) → (5,1) rovibrational transition and have achieved sub-kHz resonance linewidths that allow us to determine the transition frequency with a statistical uncertainty of less than 100 Hz, corresponding to a relative precision well below 1 ppt.

https://gsi-fair.zoom.us/j/63856816325
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