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MO: Molekülphysik

MO 57: Poster: Cold Molecules

MO 57.8: Poster

Thursday, March 16, 2006, 16:30–18:30, Labsaal

Cold Collisions of KRb studied by High Resolution Molecular Spectroscopy — •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

Detailed knowledge of the electronic ground states of KRb allows for the description of cold collisions, which are governing the dynamics of ultracold K-Rb mixtures in two species traps. We record the relevant spectroscopic data with a Fourier transform spectrometer by recording laser induced fluorescence of KRb. The closer the observed levels lie at the ground state asymptote, the more relevant is the information for derivation of the scattering length or Feshbach resonance positions. The spectroscopic data allow a precise determination of the potential energy curves for singlet and triplet ground state, and together with data input from recent Feshbach resonance measurements [1] also a precise description of the long range properties for all hyperfine asymptotes becomes derivable. The status of the analysis will be reported.

[1] Francesca Ferlaino, et al., arXiv:cond-mat/0510630 v1 24 Oct 2005