Ionization spectra of highly Stark shifted rubidium Rydberg states

Abstract

We report on the observation and numerical calculation of ionization spectra of highly Stark-shifted Rydberg states of rubidium beyond the classical ionization threshold. In the numerical calculations, a complex absorbing potential (CAP) allows us to predict the energy levels and ionization rates of Rydberg states in this regime. Our approach of adjusting the CAP to the external electric field reduces the number of free parameters from one per resonance to a single one. Furthermore, we have measured the ionization spectra of magneto-optically trapped rubidium atoms which are excited to principal quantum numbers of 43 and 70 at various electric fields. The emerging ions are detected using an ion optics. We find good agreement between the numerically and experimentally obtained spectra.

arXiv comment8 pages, 8 figures

References in corpus (8)

• Spatially Resolved Excitation of Rydberg Atoms and Surface Effects on an Atom Chip
• Measurement of absolute transition frequencies of 87Rb to nS and nD Rydberg states by means of electromagnetically induced transparency
• Detrimental adsorbate fields in experiments with cold Rydberg gases near surfaces
• Electrometry near a dielectric surface using Rydberg electromagnetically induced transparency
• Measurement and numerical calculation of Rubidium Rydberg Stark spectra
• Adsorbate Electric Fields on a Cryogenic Atom Chip
• Determination of the Rb ng-series quantum defect by electric-field-induced resonant energy transfer between cold Rydberg atoms
• A high resolution ion microscope for cold atoms

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• Rydberg state ionization dynamics and tunnel ionization rates in strong electric fields