Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Ultra-cold atoms, ions and BEC (with A)
Q 12.49: Poster
Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof
Coulomb explosion imaging of 6Li2 Feshbach molecules in a reaction microscope — •Niels Kurz, Alexander Dorn, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
A reaction microscope enables the imaging of the spatial structure of complex molecules by instant ionization of all constituent particles using e.g. fs laser pulses, a technique coined “Coulomb Explosion Imaging“. The use of ultracold targets in a reaction microscope has been successfully applied to investigate multi-photon ionization of 7Li in 800 nm fs pulses or in intense VUV light at the FLASH facility in Hamburg [M. Schuricke, K. Bartschat, A. N. Grum-Grzhimailo, G. Zhu, J. Steinmann, R. Mooshammer, 2009].
Unprecedented is the combination of this technique with an ultra-cold target of weakly bound di-atomic molecules formed from fermionic atoms (6Li in our case) by the use of Feshbach resonances. In the universal regime the spatial extension of Feshbach molecules can be tuned over a wide range, by using only one experimental parameter, to create molecules with a spatial extent of up to 10.000 Bohr radii.
We present a project aimed at creating firstly a BEC of di-atomic 6Li molecules and secondly few-fermion systems as targets in a reaction microscope by the use of the so-called spilling technique [F. Serwane, S. Jochim, 2011]. This will result in the first measurement of inter-atomic distance in 6Li2 Feshbach molecules with tunable interatomic distance.