Paschen-Back effects and Rydberg-state diamagnetism in vapor-cell electromagnetically induced transparency
AbstractWe report on rubidium vapor-cell Rydberg electromagnetically induced transparency (EIT) in a 0.7 T magnetic field where all involved levels are in the hyperfine Paschen-Back regime, and the Rydberg state exhibits a strong diamagnetic interaction. Signals from both Rb85 and Rb87 are present in the EIT spectra. Isotope-mixed Rb cells allow us to measure the field strength to within a ±0.12% relative uncertainty. The measured spectra are in excellent agreement with the results of a Monte Carlo calculation and indicate unexpectedly large Rydberg-level dephasing rates. Line shifts and broadenings due to magnetic-field inhomogeneities are included in the model.