Frankfurt 2006 – scientific programme
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Q: Quantenoptik und Photonik
Q 21: Ultrakalte Moleküle
Q 21.3: Talk
Tuesday, March 14, 2006, 11:10–11:25, HII
Predictions of scattering length and Feshbach resonances from molecular spectroscopy of mixed alkalis — •A. Gerdes1, O. Docenko2, M. Tamanis2, R. Ferber2, A. Pashov3, H. Knöckel1, and E. Tiemann1 — 1Institut für Quantenoptik, Universität Hannover, Welfengarten 1, 30167 Hannover — 2Department of Physics and Institute of Atomic Physics and Spectroscopy, University of Latvia, Rainis Boulevard 19, LV 1586 Riga, Latvia — 3Department of Physics, Sofia University, 5 James Bourchier blvd, 1164 Sofia, Bulgaria
For BEC experiments of mixed alkali systems scattering lengths for cold atomic collisions should be known. With molecuar spectroscopy we can provide this information by investigating the high vibrational levels of the X1Σ+ state and the a3Σ+ state simultaneously [1]. In a simple spectroscopic experiment with Fourier-Transform spectroscopy on laser-induced fluorescence in a heatpipe data were aquired for precise descriptions of the singlet and triplet ground state potentials of mixed alkali dimers like KRb, NaRb [2] and NaCs. Even more precise information on the long range behaviour of the atoms can be inferred from molecular beam experiments and multistep excitation of molecules. Such an experiment was done for Na2 and is presently under way for K2. The talk will give an introduction into the methods, the applied theoretical models, and their prospects combining molecular spectroscopy an Feshbachresonance spectroscopy on ultracold ensembles.
[1] J. Venturi et al. J. Phys. B 34, 4339, 2001.
[2] A. Pashov et al. Phys. Rev. A, Potentials for modeling cold collisions between Na and Rb atoms, in press