2025/02/28 by Allinson, Gianluca, Downes, Lucy A., Weatherill, Kevin J. +1 · 2 citations
#Atomic Physics (physics.atom-ph) #FOS: Physical sciences
paper · doi:10.48550/arxiv.2502.20961
We present new measurements of quantum defects and core polarizabilities in cesium (133Cs), based on transition frequency measurements between Rydberg states (14 ≤ n ≤ 38) obtained through terahertz (THz) and radio-frequency spectroscopy in a thermal atomic vapor. %By detuning resonant fields coupling neighbouring Rydberg states, we observe a detuning-dependent asymmetry in the line shape which can be used to extract the frequency of the transition. We perform a global fitting of our measurements to extract quantum defects of the s1/2, p1/2, p3/2, d3/2, d5/2, f5/2, f7/2, g7/2 and g9/2 electronic states. Transitions between high angular momentum states (4 ≤ ℓ ≤ 8) were measured to extract the Cs+ dipole and quadrupole polarizabilities. We find αd = 15.729(18) a03 and αq = 76.3(1.9) a05 respectively. Using these results, and accounting for the covariances between parameters in the global fit, the energies for nℓj Rydberg states can be estimated to a precision of a few MHz or less.