Frankfurt 2006 – scientific programme

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A: Atomphysik

A 9: Poster I: Ultrakalte Atome und BEC

A 9.11: Poster

Tuesday, March 14, 2006, 16:30–18:30, Labsaal

A toolbox for the theoretical description of ultracold atomic collisions — •Yulian Vanne and Alejandro Saenz — AG Moderne Optik, Institut für Physik, Humboldt-Universität zu Berlin, Hausvogteiplatz 5-7, 10117 Berlin

The theoretical description of collisions between ultracold atoms is very challenging. It starts with the requirement for a very accurate description of the interatomic potential curve which usually needs a combined theoretical and experimental input and continues with the solution of the Schrödinger equation describing scattering processes that occur on these potential curves. In the case of alkali atoms, the number of vibrational states supported by a single potential curve can easily exceed 100, and this leads to a numerically difficult description of scattering processes, especially if short-range interactions are important like in tight traps. Since a number of fascinating experiments in the field of ultracold physics of dilute atomic gases is based on magnetic-field induced Feshbach resonances, their description is also vital. We report on a recently developed program package that allows for very accurate calculations of the potential curves between (effective) one-electron atoms (of the same or different species), the solution of the nuclear-motion problem in these potential curves in the single channel case, and the treatment of the multi-channel case needed for the evaluation of magnetic Feshbach resonances. Examples of the performance of the package are given.