Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 37: Cold Molecules III

Q 37.2: Vortrag

Mittwoch, 16. März 2011, 16:45–17:00, BAR Schön

High resolution spectroscopy of Rb₂ triplet molecules — •Christoph Strauss^1,2, Tetsu Takekoshi², Florian Lang², Klaus Winkler², Rudolf Grimm^2,3, Marius Lysebo⁴, Leif Veseth⁴, Eberhard Tiemann⁵, and Johannes Hecker Denschlag¹ — ¹Universität Ulm, Institut für Quantenmaterie, Albert-Einstein-Allee 45, D-89081 Ulm, Germany — ²Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, A-6020 Innsbruck, Austria — ³Institut für Quantenoptik und Quanteninformation der Österreichischen Akademie der Wissenschaften, A-6020 Innsbruck, Austria — ⁴Department of Physics, University of Oslo, 0316 Oslo, Norway — ⁵Gottfried Wilhelm Leibniz Universität Hannover, D-30167 Hannover, Germany

A detailed understanding of the molecular level structure is essential for future cold collision experiments of ultracold molecules such as Rb₂. We present a complete analysis of the triplet ground state a³Σ_u⁺ and the first excited triplet state (1)³Σ_g⁺ of Rubidium 87 discussing its vibrational, rotational, hyperfine and Zeeman structure. We perform laser spectroscopy on ultracold Feshbach molecules to obtain precision data with a typical resolution of a few tens of MHz. We can describe and understand the experimental spectra quite well using model Hamiltonians. As a result we obtain optimized a³Σ_u⁺ and the X¹Σ_g⁺ Born-Oppenheimer potentials within a coupled channel model. We gain interesting insights on level mixing of singlet and triplet states, and obtain evidence that the hyperfine structure in these molecules depends weakly on the vibrational level.