Düsseldorf 2007 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 27: Kalte Moleküle II (gemeinsam mit MO)
Q 27.7: Vortrag
Dienstag, 20. März 2007, 15:45–16:00, 6B
Deceleration of polar molecules using a microstructured electrode array — •Samuel Meek, Hendrick Bethlem, Horst Conrad, and Gerard Meijer — Fritz-Haber-Institut der MPG, Faradayweg 4-6, 14195 Berlin
By utilizing the forces that polar molecules experience in inhomogenous electric fields, a variety of molecular-optical elements have been experimentally demonstrated. While previous electrode configurations at the mm scale require potential differences of tens of kV at the electrodes, similar fields can be produced between 10 µ m-sized electrodes using potentials of hundreds of volts. Here, we present trajectory calculations for a recently constructed electrostatic decelerating and trapping device consisting of a periodic array of 1254 microstructured linear electrodes deposited on a planar glass substrate. Application of harmonic waveforms to periodic groups of six electrodes forms a series of periodic minima which move along the array in a continuous manner without changing their distances above the electrodes. Deceleration is achieved by linearly reducing the frequency of the applied waveforms.
First experiments have already been performed using beams of a 3Π1 CO, which has a lifetime of a few milliseconds. Such a long lifetime allows laser excitation directly after the nozzle where the densities are higher, followed by detection of the fluorescence with a photomultiplier tube, or using Auger deexcitation at a microchannel plate or a gold surface. Operating the device in a mirror mode by applying a static dipole field, we were able to vary the deflection of the molecules from one to four degrees, simply by changing the tilt of the structure.
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