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A: Fachverband Atomphysik

A 3: Ultracold atoms, ions, and BEC I (joint session A/Q)

A 3.5: Vortrag

Montag, 9. März 2020, 12:15–12:30, f303

Autodetachment reaction dynamics in anion-atom reactions. — •Saba Zia Hassan^1,2, Jonas Tauch¹, Milaim Kas^4,5, Markus Nötzold³, Henry Lopez¹, Eric Endres¹, Roland Wester³, and Matthias Weidemüller^1,2 — ¹Physikalisches Institut Heidelberg, INF 226, 69120 Heidelberg — ²International Max Planck Research School for Quantum Dynamics, Max Planck Institute for Nuclear Physics, 69117 Heidelberg — ³Institut für Ionenphysik und Angewandte Physik, Technikerstraße 25/3, 6020 Innsbruck — ⁴Département de Chimie, Faculté des Sciences, Université Libre de Bruxelles (ULB), 1050 Brusseles — ⁵Deutsches Elektronen-Synchrotron (DESY), 22607 Hamburg

Associative detachment (AD) reactions play a key role in the destruction of anions to form neutral molecules in chemical networks, like interstellar medium, Earth’s ionosphere and biochemistry. Here, we investigate AD reactions involving a closed-shell anion OH⁻ and rubidium atoms in a hybrid atom-ion trap. The overlap of atoms and anions leads to elastic and inelastic collisions, cooling the external and internal degrees of freedom respectively. Ab-initio calculations also predict the occurrence of AD reaction, i.e. Rb+OH⁻→ RbOH. A detailed experimental investigation of AD reactions can serve as a stringent test on the effective core potentials used in theoretical studies. Furthermore, with a precise control on the fraction of electronically excited rubidium in the ensemble, the dynamics of quantum state dependent reactive collisions can be studied. In this contribution the latest results will be presented.