Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 28: Poster: Ultra-cold plasmas and Rydberg systems (with Q)

A 28.6: Poster

Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais

Spectroscopy of Rydberg pair states in an ultracold cesium gas — Heiner Sassmannshausen and •Johannes Deiglmayr — ETH Zurich, Laboratory of Physical Chemistry, Zurich, Switzerland

We have recently setup an experiment which allows us to study transitions between Rydberg states by high-resolution millimeter-wave spectroscopy under conditions where the stray electric and magnetic fields are reduced to below 1 mV/cm and 2 mG, respectively. Measurements of the hyperfine-splitting of atomic Rydberg states with principal quantum number beyond n=100, showing transform-limited linewidths of better than 20 kHz, demonstrated the performance of the setup [1].

Recently an optical dipole trap was added to the setup to investigate the Rydberg excitation in denser samples of ultracold atoms. We have observed the excitation of dipole-forbidden pair-states, which we attribute to the formation of so called "macro dimers" [2]. The current status of these experiments will be presented.

[1] H. Sassmannshausen, F. Merkt, J. Deiglmayr, Phys. Rev. A 87, 032519 (2013) [2] S.M. Farooqi, et al., Phys. Rev. Lett. 91, 183002 (2003)