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Q: Fachverband Quantenoptik und Photonik
Q 63: Poster Ultrakalte Moleküle
Q 63.3: Poster
Donnerstag, 22. März 2007, 16:30–18:30, Poster C
Formation, Control and Spectroscopy of Cesium Feshbach Molecules — •Michael Mark1, Francesca Ferlaino1, Steven Knoop1, Johann Georg Danzl1, Harald Schöbel1, Tobias Kraemer1, Hanns-Christoph Nägerl1, and Rudi Grimm1,2 — 1Institut für Experimentalphysik, Universität Innsbruck, Austria — 2Institut für Quantenoptik und Quanteninformation, Innsbruck, Austria
We present our work on magnetic control of ultracold Cesium Feshbach molecules in an optical dipole trap. Starting with an ultracold Cs gas at 250 nK we create samples of ultracold trapped d- and g-wave molecules on various Feshbach resonances. After the initial formation we transfer the samples into other dimer states by adiabatically following or nonadiabatically jumping avoided crossings between intersecting molecular states. By this method we have complete control over the quantum state of the sample and we can populate all dimer states with s-, d-, g- and l-wave character up to binding energies of 10 MHz and magnetic fields up to 55 G [1]. In particular we show that molecular states with high relative angular momentum l=8 can be addressed for which direct Feshbach association is not feasible as a result of negligible coupling with the s-wave atomic threshold. To map out the molecular state structure we perform magnetic moment spectroscopy. From the avoided crossing we can determine the coupling strength between the different molecular states. In addition we use precise microwave spectroscopy to investigate the universal character of a weakly bound s-wave state. [1] M. Mark et al, submitted to PRA (2007)