Stepwise contraction of the nf Rydberg shells in the 3d photoionization of multiply-charged xenon ions

@article{Schippers2014StepwiseCO,
  title={Stepwise contraction of the nf Rydberg shells in the 3d photoionization of multiply-charged xenon ions},
  author={Stefan Schippers and A Borovik and T. Buhr and Jonas Hellhund and Kristof Holste and A. L. David Kilcoyne and Stephan Klumpp and M. Martins and Alfred M{\"u}ller and S{\'a}ndor Ricz and Stephan Fritzsche},
  journal={Journal of Physics: Conference Series},
  year={2014},
  volume={635}
}
Photoionization of Xe3+, Xe4+ and Xe5+ ions was measured in the energy range 670-750 eV, including the 3d ionization threshold. The cross sections exhibit a progressively larger number of sharp resonances as the ion charge state is increased. This clearly visualizes the re-ordering of the εf continuum into a regular series of (bound) Rydberg orbitals as the ionic core becomes more attractive. 

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