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MO: Fachverband Molekülphysik
MO 11: Kalte Moleküle 2
MO 11.5: Vortrag
Dienstag, 3. März 2009, 15:00–15:15, VMP 6 HS-G
Cold guided beams of water isotopologues — •Laurens D. van Buuren, Michael Motsch, Christian Sommer, Martin Zeppenfeld, Pepijn.W.H. Pinkse, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany
Electrostatic velocity filtering and guiding is an established technique to produce high fluxes of cold polar molecules [1]. The method is applicable to all polar molecules, but the beam characteristics depend strongly on the Stark shift properties of the molecules. In the experiment, we produce cold guided beams of the three water isotopologues H2O, D2O and HDO at temperatures of the order of 1 K. Their different rotational constants and orientations of electric dipole moments lead to remarkably different Stark shift properties, despite the molecules being very similar in a chemical sense. Therefore, the signals of the guided water isotopologues differ on an absolute scale and also exhibit characteristic electrode voltage dependencies. We find excellent agreement between the relative guided fractions and voltage dependencies of the investigated isotopologues and predictions made by our theoretical model of electrostatic velocity filtering [2].
[1] T. Junglen et al., Eur. Phys. J. D 31, 365 (2004)
[2] M. Motsch et al., arXiv:physics 0809.1728 (2008)