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Hannover 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Hannover musste abgesagt werden! Lesen Sie mehr ...

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MO: Fachverband Molekülphysik

MO 19: MO Poster 4

MO 19.13: Poster

Donnerstag, 12. März 2020, 17:00–19:00, Empore Lichthof

Quantum-state-controlled Penning collisions between lithium and metastable helium atoms — •Alexandra Tsoukala, Tobias Sixt, Jiwen Guan, Frank Stienkemeier, and Katrin Dulitz — Institute of Physics, University of Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg im Breisgau, Germany

Our research focuses on understanding the mechanistic details of reactive collisions in order to enable control of their outcome. In our experiment, we study quantum-state-controlled Penning collisions between lithium (Li) and metastable helium (He*) atoms. For this purpose, a supersonic beam source of He* atoms is combined with a target of ultracold lithium (Li) atoms confined in a magneto-optical trap (MOT). The full quantum-state control of the reaction partners is achieved by producing a pure beam of He(23S1) via the optical depletion of the He(21S0) state using a novel excitation scheme. Additionally, both Li and He* atoms are optically pumped into selected electronically excited or magnetic substates. By alternating the combination of quantum-states for both He* and Li, we observe strong dependencies of the reactivity on the mutual electron spin and angular momentum orientation.

In this contribution, I will give an overview over the different techniques used to achieve quantum-state control of the reaction partners and I will discuss recent experimental results.

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