SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 28: Ultra-cold Plasmas and Rydberg Systems II (joint session A/Q)

A 28.5: Talk

Friday, March 10, 2023, 12:15–12:30, F107

Diffusive-like Redistribution in State-changing Collisions between Rydberg Atoms and Ground State Atoms — •Markus Exner, Philipp Geppert, Max Althön, and Herwig Ott — Department of Physics and Research center OPTIMAS, RPTU Kaiserslautern-Landau

We report on inelastic collisions between Rydberg and ground state atoms. Our experiment starts with a cloud of ultracold Rubidium atoms in a crossed dipole trap. Using a three-photon excitation scheme, we photoassociate ultralong-range Rydberg molecules with huge bond lengths . These exotic molecular species are formed by a Rydberg atom and ground state atom, where the binding mechanism originates from scattering interaction between Rydberg electron and the ground state atom. We have observed the decay of these molecules in which the ground state atom tunnels toward the Rydberg core. During this collision a state-change of the Rydberg electron takes place. We found a redistribution of population over a wide range of final states. In addition, a decay into different orbital angular momentum states could be observed. These state-changing collisions can be described as a diffusive-like redistribution at short internuclear distances.