Hyperfine Structure of $nP_{1/2}$ Rydberg States in $^{85}$Rb

• Main Authors: Cardman, Ryan, Raithel, Georg
• Format: Journal Article
• Language: English
• Published: 18-07-2022
• Subjects: Physics - Atomic Physics; Physics - Quantum Physics
• DOI: 10.48550/arxiv.2207.08582

We measure the hyperfine structure of $nP_{1/2}$ Rydberg states using mm-wave
spectroscopy on an ensemble of laser-cooled $^{85}$Rb atoms. Systematic
uncertainties in our measurement from the Zeeman splittings induced by stray
magnetic fields and dipole-dipole interactions between two Rydberg atoms are
factored in with the obtained statistical uncertainty. Our final measurement of
the $nP_{1/2}$ hyperfine coupling constant is $A_{\text{hfs}}=1.443(31)$~GHz.
This measurement is useful for studies of long-range Rydberg molecules, Rydberg
electrometry, and quantum simulation with dipole-dipole interactions involving
$nP_{1/2}$ atoms.