Rostock 2019 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 17: Ultra-cold plasmas and Rydberg systems (joint session A/Q)

A 17.5: Vortrag

Mittwoch, 13. März 2019, 15:00–15:15, S HS 1 Physik

High-resolution spectroscopy of ³⁹K atoms and ³⁹K₂ long-range Rydberg molecules — •Michael Peper¹, Frédéric Merkt¹, and Johannes Deiglmayr^1,2 — ¹Laboratory of Physical Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland — ²Felix-Bloch-Institut, Universität Leipzig, Linnéstraße 5, 04103 Leipzig, Germany

The interaction of a Rydberg atom with a ground-state atom can be treated using scattering theory, which predicts oscillatory interaction potentials. These interaction potentials may support bound states of diatomic molecules, called long-range Rydberg molecules [1,2,3].

I will present accurate values for the ionization potential and quantum defects of the s, p, d, f and g series of ³⁹K, obtained by precision spectroscopy using frequency-comb-referenced ultraviolet and millimeter-wave radiation. The results of the spectroscopy of atomic potassium where used in the theoretical modeling and the first experimental determination of the binding energies of ³⁹K₂ long-range Rydberg molecules. These studies reveal a regime with strong hyperfine-induced mixing [3,4].

[1] C. H. Greene, A. S. Dickinson, and H. R. Sadeghpour, Phys. Rev. Lett. 85, 2458 (2000). [2] V. Bendkowsky et al., Nature 458, 1005 (2009). [3] H. Saßmannshausen, F. Merkt, and J. Deiglmayr, Phys. Rev. Lett. 114, 133201 (2015). [4] D. A. Anderson, S. A. Miller, and G. Raithel, Phys. Rev. A 90, 062518 (2014).