Dresden 2011 – scientific programme

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MO: Fachverband Molekülphysik

MO 6: Poster: Cold Molecules

MO 6.6: Poster

Monday, March 14, 2011, 16:00–18:00, P1

Fourier Transform spectroscopy and improved potential energy curve of the ground state X¹Σ⁺g of Na₂ — •Michael Steinke, Horst Knöckel, and Eberhard Tiemann — Centre for Quantum Engineering and Space Time Research (QUEST) und Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover

Investigations of the spectra of diatomic alkali molecules and the spectroscopic observations on singlet and triplet ground states together with Feshbach resonances from cold collisions of trapped atoms have turned out to be the key ingredients for describing and predicting properties of such cold collisions. During our investigations of NaLi also strong Na₂ spectra were observed, which are used to enhance the set of experimental data available and which are valuable to eliminate remaining uncertainties in the description of the potential energy curve of the singlet ground state (C. Samuelis et al., Phys. Rev. A 63, 012710 (2000)). They can also help to improve the knowledge in the singlet scattering length. Known Feshbach resonances from cold collisions are mainly determined by the triplet state. The result of the combined analysis of singlet and triplet ground state will be presented.