Spectroscopy of ${}^{87}\text{Sr}$ triplet Rydberg states

Abstract

A combined experimental and theoretical spectroscopic study of high-$n$, $30\lesssim n\lesssim 100$, triplet $\text{S}$ and $\text{D}$ Rydberg states in ${}^{87}\text{Sr}$ is presented. ${}^{87}\text{Sr}$ has a large nuclear spin, $I=9/2$, and at high-$n$ the hyperfine interaction becomes comparable to, or even larger than, the fine structure and singlet-triplet splittings which poses a considerable challenge both for precision spectroscopy and for theory. For high-$n$ $\text{S}$ states, the hyperfine shifts are evaluated non-perturbatively taking advantage of earlier spectroscopic data for the $I=0$ isotope ${}^{88}\text{Sr}$, which results in good agreement with the present measurements. For the $\text{D}$ states, this procedure is reversed by first extracting from the present ${}^{87}\text{Sr}$ measurements the energies of the ${}^3{\text{D}}_{1,2,3}$ states to be expected for isotopes without hyperfine structure (${}^{88}\text{Sr}$) which allows the determination of corrected quantum defects in the high-$n$ limit.

arXiv comment13 pages, 8 figures

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• Measurement of the strontium triplet Rydberg series by depletion spectroscopy of ultracold atoms
• Rydberg quantum computation with nuclear spins in two-electron neutral atoms
• Hyperentanglement of divalent neutral atoms by Rydberg blockade
• Rydberg Macrodimers: Diatomic molecules on the micrometer scale
• Trap-loss spectroscopy of Rydberg states in ytterbium
• Impacts of random filling on spin squeezing via Rydberg dressing in optical clocks
• Coherence-preserving cooling of nuclear spin qubits in a weak magnetic field
• Fast nuclear-spin gates and electrons-nuclei entanglement of neutral atoms in weak magnetic fields
• Rydberg electromagnetically induced transparency and absorption of strontium triplet states in a weak microwave field