Measurement of the hyperfine coupling constant for $n{S}_{1/2}$ Rydberg states of ${}^{85}$Rb

Abstract

We present measurements of the hyperfine structure splittings of $n{S}_{1/2}$ Rydberg states of ${}^{85}$Rb for $n$= 43, 44, 45 and 46. From the splittings, the hyperfine coupling constant, $A_{\mathrm{HFS}}$, is determined to be 15.372(80) GHz. This result is an order-of-magnitude improvement from previous measurements. We study and account for systematic uncertainty sources, such as unwanted electric and magnetic fields, dipolar Rydberg-Rydberg interactions, and AC shifts. Initial evidence for hyperfine-mixed Rydberg pair states is found.

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• Investigation on the Cs 6S1=2 to 7D electric quadrupole transition via monochromatic two-photon process at 767 nm
• Measuring the hyperfine splittings and deriving the hyperfine-interaction constants of Cesium 7D 5/2 excited state