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Q: Quantenoptik und Photonik
Q 34: Poster Quantengase
Q 34.3: Poster
Dienstag, 14. März 2006, 16:30–18:30, Labsaal
A Quantum Scanning Electron Microscope for Ultracold Atoms — •Tatjana Gericke, Claudia Utfeld, and Herwig Ott — Institut für Physik, Universität Mainz, Staudingerweg 7, 55128 Mainz
Ultracold atoms have proven to be a powerful tool for studying fundamental quantum effects of many body systems. In most experiments the information about the system is extracted from absorption images. This widely used technique has two major limitations. First, it is not sensitive on the single atom level and second, its spatial resolution is restricted by the optical wavelength. In fact, only very few experiments have demonstrated a resolution of better than 1 µm. This is especially relevant, as the average atomic distance in degenerate quantum gases is typically between 100 and 500 nm. In our experiment we want to develop a new imaging technique, which overcomes both limitations. It is based on the principles of scanning electron microscopy and employs the spatially resolved ionization of ultracold atoms. An electron beam which can be focussed down to 20 nm is directed onto an atomic ensemble. Atoms that move through the electron beam can be ionized and subsequently detected with high efficiency on an ion detector. The scanning capability of the electron beam allows for the imaging of small areas as well as for time resolved in situ measurements. The ultracold atoms will be loaded from a 2D MOT and prepared in a CO2-dipole trap. The current state of the experiment is presented.