Precision measurement of the ionization energy of Cs I

Abstract

We present absolute-frequency measurements for the transitions from the 6s${}_{1/2}$ ground state of ${}^{133}$Cs to $n$p${}_{1/2}$ and $n$p${}_{3/2}$ Rydberg states. The transition frequencies are determined by one-photon UV spectroscopy in ultracold samples of Cs atoms using a narrowband laser system referenced to a frequency comb. From a global fit of the ionization energy $E_{\mathrm{I}}$ and the quantum defects of the two series we determine an improved value of $E_{\mathrm{I}}=hc\cdot 31406.4677325(14)$ cm${}^{-1}$ for the ionization energy of Cs with a relative uncertainty of $5\times 10^{-11}$. We also report improved values for the quantum defects of the $n$p${}_{1/2}$, $n$p${}_{3/2}$, $n$s${}_{1/2}$, and $n$d${}_{5/2}$ series.

8 pages, 4 figures

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