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arXiv · 1810.07611

Measurement of the strontium triplet Rydberg series by depletion spectroscopy of ultracold atoms

Luc Couturier·Ingo Nosske·Fachao Hu·Canzhu Tan·Chang Qiao·Y. H. Jiang·Peng Chen·Matthias Weidemüller
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Abstract

We report on the atom loss spectroscopy of strontium Rydberg atoms in a magneto-optical trap, using a two-photon excitation scheme through the intermediate state $5\mathrm{s}5\mathrm{p} \, ^3\mathrm{P}_1$. Energies of the $5\mathrm{s}n\mathrm{s} \, ^3\mathrm{S}_1$ and $5\mathrm{s}n\mathrm{d} \, ^3\mathrm{D}_{1,2}$ Rydberg series of $^{88}$Sr in the range $13 \leq n \leq 50$ are determined with an absolute accuracy of 10 MHz, including the perturbed region where the $5\mathrm{s}n\mathrm{d} \, ^3\mathrm{D}_{2}$ series couples to the $5\mathrm{s}n\mathrm{d} \, ^1\mathrm{D}_{2}$ series. This represents an improvement by more than two orders of magnitude compared to previously published data. The quantum defects for each series are determined using the extended Rydberg-Ritz formula in the range where there is no strong perturbation. A value of $1\,377\,012\,721(10) \,\mathrm{MHz}$ for the first ionization limit of $^{88}$Sr is extracted.

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Luc Couturier, Ingo Nosske, Fachao Hu, Canzhu Tan, Chang Qiao, Y. H. Jiang, Peng Chen, Matthias Weidemüller. 2018-10-17. Measurement of the strontium triplet Rydberg series by depletion spectroscopy of ultracold atoms. https://doi.org/10.1103/physreva.99.022503

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