Hannover 2013 – scientific programme

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A: Fachverband Atomphysik

A 41: Poster: Electron scattering and recombination

A 41.2: Poster

Thursday, March 21, 2013, 16:00–18:30, Empore Lichthof

Electron-atom collisions studied in a MOTReMi apparatus — •Elisabeth Brühl, Natalia Ferreira, Johannes Goullon, Renate Hubele, Hannes Lindenblatt, Michael Schuricke, Alexander Dorn, and Daniel Fischer — Max-Planck Institut für Kernphysik, Heidelberg

Studying the dynamics of atomic collisions, reaction microscopes (ReMi) have been used as a powerful experimental tool for nearly two decades. ReMis make the momentum information of all collision products over the full solid angle accessible. In our experiment we combine a ReMi with a magneto-optically trapped (MOT) target of lithium atoms (MOTReMi). Due to its electronic structure with its two strongly correlated inner electrons and a single valence electron, lithium is an ideal candidate to examine electronic correlation and collision dynamics of simple few-body systems. In addition, this element has the advantage that it can be relatively easily cooled down to temperatures well below mK. One of the main technical challenges for the combination in a MOTReMi is the superposition of two magnetic fields. The inhomogeneous magnetic field of the MOT has to be switched off very fast allowing for the momentum reconstruction of the ejected electrons. The MOTReMi is currently integrated into the test storage ring (TSR) of the MPIK in Heidelberg and ion-atom collisions are observed in unprecedented details. In future experiments, an electron beam will be used as a projectile to study electron impact ionization for collision energies between 70 and 500 eV. The technical realization and the setup will be shown.