Abstract
We present absolute-frequency measurements for the transitions from the ground state of to and Rydberg states. The transition frequencies are determined by one-photon UV spectroscopy in ultracold samples of Cs atoms using a narrow-band laser system referenced to a frequency comb. From a global fit of the ionization energy and the quantum defects of the two series we determine an improved value of for the ionization energy of Cs with a relative uncertainty of . We also report improved values for the quantum defects of the , and series.
- Received 30 October 2015
DOI:https://doi.org/10.1103/PhysRevA.93.013424
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