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arXiv · 2112.04614

EIT spectroscopy of high-lying Rydberg states in $^{39}K$

Yuqi Zhu·Sumita Ghosh·S. B. Cahn·M. J. Jewell·D. H. Speller·Reina H. Maruyama
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Abstract

We present a study of the Rydberg spectrum in $^{39}K$ for $nS$ and $nD_{3/2}$ series connected to $5^2P_{1/2}$ using two-photon spectroscopy based on EIT in a heated vapor cell. We observed some 80 transitions from $5P_{1/2}$ to Rydberg states with principal quantum numbers $n\sim50-90$, and determined their transition frequencies and state energies with sub-GHz precision. Our spectroscopy results lay the groundwork for using Rydberg atoms as sensitive microwave photon detectors in searches for dark matter axions in the $\sim40-200$ $\mu$eV mass range, which is a prime range for future axion searches suggested by theory studies.

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Yuqi Zhu, Sumita Ghosh, S. B. Cahn, M. J. Jewell, D. H. Speller, Reina H. Maruyama. 2021-12-08. EIT spectroscopy of high-lying Rydberg states in $^{39}K$. https://doi.org/10.1103/physreva.105.042808

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