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Q: Fachverband Quantenoptik und Photonik

Q 24: Ultrakalte Moleküle [gemeinsam mit MO]

Q 24.6: Vortrag

Dienstag, 11. März 2008, 17:45–18:00, 3G

Photoassociation spectroscopy in a mixture of ultracold Rb and Yb atoms — Nils Nemitz, •Florian Baumer, Frank Münchow, and Axel Görlitz — Institut für Experimentalphysik, HHU Düsseldorf, Germany

Currently, many groups are pursuing the production of ultracold heteronuclear molecules in the electronic ground state. Among the most fascinating features that such a system would offer are the study of strongly dipolar quantum gases and potentially fundamental precision measurements for suitably chosen molecules.

The goal of our experiment is the formation of molecules through photoassociation of ultracold paramagnetic Rb atoms and diamagnetic Yb atoms. The first step towards this goal is the investigation of one-photon spectroscopy from the atomic ground state of the two atomic species to an electronically excited state of the heteronuclear RbYb molecule.

Here, we report on recent results of photoassociation spectroscopy close to the Rb D1-transition at 795 nm in a combined magneto-optical trap. By detecting the Yb trap loss as a function of the frequency of the photoassociation laser, we are able to observe spectral lines corresponding to several vibrational states and resolve the rotational sub-structure of the excited RbYb molecule.

The next steps will be photoassociation spectroscopy of conservatively trapped RbYb mixtures and the extension to two-photon photoassociation in order to produce ultracold ground state molecules.