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arXiv · 2304.07974

Quantum defects of $n$F$_J$ levels of Cs Rydberg atoms

Jingxu Bai·Yuechun Jiao·Rong Song·Jiabei Fan·Jianming Zhao·Suotang Jia·Georg Raithe
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Abstract

We present precise measurements of the quantum defects of cesium $n$F$_J$ Rydberg levels. We employ high-precision microwave spectroscopy of $(n+2)\mathrm{D}_{5/2}\rightarrow n\mathrm{F}_{5/2,7/2}$ transitions for $n=45$ to 50 in a cold-atom setup. Cold cesium $(n+2)$D$_{5/2}$ atoms, prepared via two-photon laser excitation, are probed by scanning weak microwave fields interacting with the atoms across the $n\mathrm{F}_{5/2,7/2}$ resonances. Transition spectra are acquired using state-selective electric-field ionization and time-gated ion detection. Transition-frequency intervals are obtained by Lorentzian fits to the measured spectral lines, which have linewidths ranging between 70~kHz and 190~kHz, corresponding to about one to three times the Fourier limit. A comprehensive analysis of relevant line-shift uncertainties and line-broadening effects is conducted. We find quantum defect parameters $δ_{0}(\mathrm{F}_{5/2})=0.03341537(70)$ and $δ_{2}(\mathrm{F}_{5/2})=-0.2014(16)$, as well as $δ_{0}(\mathrm{F}_{7/2})=0.0335646(13)$ and $δ_{2}(\mathrm{F}_{7/2})=-0.2052(29)$, for $J=5/2$ and $J=7/2$, respectively. Fine structure parameters $A_{FS}$ and $B_{FS}$ for Cs $n{\rm{F}}_J$ are also obtained. Results are discussed in context with previous works, and the significance of the results is discussed.

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Jingxu Bai, Yuechun Jiao, Rong Song, Jiabei Fan, Jianming Zhao, Suotang Jia, Georg Raithe. 2023-04-17. Quantum defects of $n$F$_J$ levels of Cs Rydberg atoms. https://doi.org/10.1103/physreva.108.022804

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