Erlangen 2022 – scientific programme
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A: Fachverband Atomphysik
A 12: Ultracold Atoms and Plasmas (joint session Q/A)
A 12.14: Poster
Tuesday, March 15, 2022, 16:30–18:30, P
Towards the formation of ultracold ion-pair-state molecules — •Martin Trautmann, Anna Selzer, Lukas Müller, Michael Peper, and Johannes Deiglmayr — Leipzig University, Department of Physics and Geosciences, 04103 Leipzig, Germany
Recently it was proposed that a gas of long-range Rydberg molecules (LRM) may be converted into a gas of ultracold molecules in ion-pair states (UMIPS) by stimulated deexcitation [1,2]. UMIPS may facilitate the creation of a strongly correlated plasma with equal-mass charges [3], a system hitherto unavailable for laboratory studies, and provide a source of ultracold anions, e.g. for the sympathetic cooling of anti-protons [4]. To explore the proposed route towards the creation of UMIPS, we first create a gas of Cs2 LRMs using photoassociation (PA). By referencing the PA laser to an atomic spectroscopy via an electronic-sideband-locked transfer cavity, we can stabilize the PA lasers frequency to arbitrary molecular resonances with frequency fluctuations of less than 0.3 MHz per day. To drive the transition towards UMIPS, we have set up a pulsed Mid-IR laser with pulse energies around 1 mJ and a transform-limited bandwidth of 130 MHz. This improved spectroscopic setup will be presented together with the current status of our experiments.
[1] M. Peper, J. Deiglmayr, J. Phys. B 53, 064001 (2020) [2] F. Hummel et al., New J. Phys. 22, 063060 (2020) [3] F. Robicheaux et al., J. Phys. B 47, 245701 (2014) [4] C. Cerchiari et al., Phys. Rev. Lett. 120, 133205 (2018)