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A: Fachverband Atomphysik

A 19: Ultracold atoms III: Manipulation and detection / Rydbergatoms (with Q)

A 19.5: Vortrag

Mittwoch, 4. März 2009, 17:30–17:45, Audi-B

Image formation in scanning electron microscopy of ultracold quantum gases — •Peter Würtz, Tatjana Gericke, Andreas Koglbauer, and Herwig Ott — Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz

We review the image formation and reconstruction of our recently developed scanning electron microscope for ultracold atoms. In our experimental setup, a focussed electron beam with a FWHM of 100 nm ionizes atoms, which are subsequentl y accelerated towards an ion detector. Obtaining images from the time resolved signal of ion detection events involves several post-processing methods to account for effects disturbing the imaging process. For applications with optical la ttices, drifts and fluctuations of the lattice potential have to be determined and compensated for. We discuss differen t imaging modes and interaction mechanisnms and show that the microscope is a very versatile tool for the detection and manipulation of ultracold atoms.