Probing an Electron Scattering Resonance using Rydberg Molecules within a Dense and Ultracold Gas.

@article{Schlagmueller2016ProbingAE,
  title={Probing an Electron Scattering Resonance using Rydberg Molecules within a Dense and Ultracold Gas.},
  author={Michael Schlagmueller and Tara Cubel Liebisch and Huan Nguyen and Graham Lochead and Felix C. Engel and Fabian Boettcher and Karl M. Westphal and Kathrin S. Kleinbach and Robert L{\"o}w and S. Hofferberth and Tilman Pfau and Jes{\'u}s P{\'e}rez-R{\'i}os and Chris H Greene},
  journal={Physical review letters},
  year={2016},
  volume={116 5},
  pages={
          053001
        }
}
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 Segrè 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… CONTINUE READING
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