Probing an Electron Scattering Resonance using Rydberg Molecules within a Dense and Ultracold Gas
| Autor: | Michael Schlagmüller, G. Lochead, Robert Löw, Sebastian Hofferberth, Fabian Böttcher, Huan Nguyen, Tara Cubel Liebisch, Jesús Pérez-Ríos, Chris H Greene, Karl M. Westphal, Kathrin S. Kleinbach, Felix Engel, Tilman Pfau |
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| Rok vydání: | 2015 |
| Předmět: |
Shape resonance
General Physics and Astronomy Electrons 01 natural sciences Resonance (particle physics) 010305 fluids & plasmas symbols.namesake Rydberg constant 0103 physical sciences Principal quantum number Scattering Radiation Rydberg matter Physics::Atomic Physics 010306 general physics Condensed Matter::Quantum Gases Physics Spectrum Analysis Models Theoretical Cold Temperature Excited state Rydberg atom symbols Rydberg formula Quantum Theory Thermodynamics Gases Atomic physics Elementary Particles |
| Zdroj: | Physical review letters. 116(5) |
| ISSN: | 1079-7114 |
| Popis: | We present spectroscopy of a single Rydberg atom excited within a Bose-Einstein condensate. We not only observe the density shift as discovered by Amaldi and Segre in 1934, but a line shape that changes with the principal quantum number n. The line broadening depends precisely on the interaction potential energy curves of the Rydberg electron with the neutral atom perturbers. In particular, we show the relevance of the triplet p-wave shape resonance in the e^{-}-Rb(5S) scattering, which significantly modifies the interaction potential. With a peak density of 5.5×10^{14} cm^{-3}, and therefore an interparticle spacing of 1300 a_{0} within a Bose-Einstein condensate, the potential energy curves can be probed at these Rydberg ion-neutral atom separations. We present a simple microscopic model for the spectroscopic line shape by treating the atoms overlapped with the Rydberg orbit as zero-velocity, uncorrelated, pointlike particles, with binding energies associated with their ion-neutral separation, and good agreement is found. |
| Databáze: | OpenAIRE |
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