Erlangen 2022 – scientific programme

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A: Fachverband Atomphysik

A 33: Rydberg Systems (joint session Q/A)

A 33.2: Talk

Friday, March 18, 2022, 10:45–11:00, Q-H14

Structure and dynamics of cesium long-range Rydberg molecules — •Michael Peper, Ali-Dzhan Ali, Martin Trautmann, and Johannes Deiglmayr — Leipzig University, Department of Physics and Geosciences, 04103 Leipzig, Germany

Long-range Rydberg molecules (LRMs) are exotic bound states of a Rydberg atom and a ground-state atom within its orbit. Because their structure is very sensitive to the elastic electron–ground-state-atom scattering phase shifts, precision measurements and accurate theoretical modelling may provide a unique possibility to test quantum scattering theories for such systems at extremely low collision energies [1]. A detailed understanding of the structure of LRMs is also a prerequisite for the proposed creation of ultracold neutral plasmas with equal-mass charges via photoassociation (PA) and stimulated charge-transfer of LRMs [2,3].

In this talk I will present recent results on the modelling of experimental PA spectra using an accurate Hamiltonian [4] and optimized scattering phase shifts. I will discuss in detail the characterization of molecular decay processes and the role of Stark-facilitated excitation of Rydberg atoms at molecular PA resonances.

[1] M. Peper, J. Deiglmayr, Phys. Rev. Lett. 126, 013001 (2021) [2] M. Peper, J. Deiglmayr, J. Phys. B 53, 064001 (2020) [3] F. Hummel et al., New J. Phys. 22, 063060 (2020) [4] M. Eiles, C. Greene, Phys. Rev. A 95, 042515 (2017)