Cold guided beams of water isotopologs

Details Cold guided beams of water isotopologs Cold guided beams of water isotopologs

2008-09-10

arxiv.org/abs/0809.1728v2

Phys. Rev. A 79, 013405 (2009)

Physics

Chemical Physics

14 pages, 13 figures; small changes to the text, updated references

Scientific paper

10.1103/PhysRevA.79.013405

Electrostatic velocity filtering and guiding is an established technique to produce high fluxes of cold polar molecules. In this paper we clarify different aspects of this technique by comparing experiments to detailed calculations. In the experiment, we produce cold guided beams of the three water isotopologs H2O, D2O and HDO. 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 isotopologs 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 isotopologs and predictions made by our theoretical model of electrostatic velocity filtering.

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