Frankfurt 2006 – wissenschaftliches Programm

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A: Atomphysik

A 9: Poster I: Ultrakalte Atome und BEC

A 9.10: Poster

Dienstag, 14. März 2006, 16:30–18:30, Labsaal

A lithium-MOT target in a reaction microscope — •Jochen Steinmann, Ganjun Zhu, Alexander Dorn, and Joachim Ullrich — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

The dynamics of few-particle quantum systems can be studied in detail by experiments on impact ionization of atoms, where the momenta of all fragments are determined simultaneously. For the first time we perform kinematically complete studies of double and triple ionization of lithium by electron impact or intense laser fields. Kinematically complete data of simple atomic systems with structureless final states, for example the extensively studied single- and double-ionization of H and He respectively, are essential for the understanding of such processes and in particular for precise testing of theoretical models. For generation of an ultracold target the widely used supersonic beam technique can hardly be applied in the case of lithium, but a magneto-optical trap (MOT) of lithium atoms with temperatures well below 1 mK is an almost ideal target for high resolution momentum spectroscopy.

This is at present the only experiment combining a reaction microscope (recoil-ion and electron spectrometer) with a MOT. However, the incompatibility of the magnetic fields of the atomic trap and the electron spectrometer and the goal of high event-rates imposes stringent conditions on design and operation of the apparatus.

We present first results on the performance of the setup.