Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 27: Kalte Moleküle II (gemeinsam mit MO)
Q 27.5: Vortrag
Dienstag, 20. März 2007, 15:15–15:30, 6B
Alternate Gradient deceleration of large molecules — •Kirstin Wohlfart, Frank Filsinger, Jochen Küpper, and Gerard Meijer — Fritz-Haber-Institut der MPG, Faradayweg 4–6, 14195 Berlin
Over the last years fascinating progress has been made in the spectroscopy of large (bio-)molecules, e.g. the building blocks of life. Meanwhile, our group has been developing methods to decelerate and cool neutral, polar molecules using time varying electric fields. In order to extend these techniques to the deceleration of large or heavy molecules, which have practically only high-field seeking states, or molecules in their absolute ground state, Alternate Gradient focusing must be applied. We showed that this technique can be used to focus and decelerate molecules in high-field seeking states [1].
Using a modular Alternate Gradient deceleration experiment different states of benzonitrile (C7H5N) and OH, in both high-field and low-field seeking components of its ground state, have been decelerated. The time-of-flight profiles are quantum-state-selectively measured using high-resolution laser induced fluorescence spectroscopy. We compare the efficiency of different high voltage switching schemes and will discuss the prospects of future experiments for the deceleration of larger molecules.
[1] H. L. Bethlem, M. Tarbutt, J. Küpper, D. Carty, K. Wohlfart, E. Hinds, and G. Meijer, J. Phys. B 39, R 263 (2006)
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