Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 15: Poster I

A 15.19: Poster

Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster

An Optical Dipole Trap Target for a Reaction Microscope — •Renate Hubele, Michael Schuricke, Jochen Steinmann, Ganjun Zhu, Alexander Dorn, and Joachim Ullrich — Max Planck Institut für Kernphysik, Heidelberg, Germany

For a thorough understanding of atomic reactions high quality experimental data on fundamental quantum systems are indispensable. One of the most sophisticated tools to study atomic fragmentation processes is the Reaction Microscope (REMI), which allows for a coincident detection of the full vector momenta of all charged final state particles over a solid angle of up to 4π. In recent years the merging of REMI spectrometers with magneto optically trapped targets became popular (MOTRIMS). Among the most important benefits of this combination compared to the conventional setup using gas jets, are lower target temperatures in the mK-regime allowing for a improved momentum resolution and the possibility of accessing target species like lithium that are hardly produced in a supersonic expansion.

However, if electrons are also to be detected, MOTRIMS setups suffer from transient eddy currents induced by the rapid turn-off of the MOT fields, limiting the momentum resolution due to stray magnetic fields in the electron spectrometer.

Therefore, our new setup will combine for the first time a purely optical dipole trap (FORT) with a REMI. Since we are already successfully operating a MOTRIMS experiment, we are now implementing a FORT in order to perform fully differential studies of lithium double and triple ionisation by photon or electron impact.