Collisional effects in the formation of cold guided beams of polar molecules

High fluxes of cold polar molecules are efficiently produced by electric guiding and velocity filtering. Here, we investigate different aspects of the beam formation. Variations of the source parameters such as density and temperature result in characteristic changes in the guided beam. These are ob...

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Bibliographic Details
Published in:arXiv.org 2008-12
Main Authors: Motsch, Michael, Sommer, Christian, Zeppenfeld, Martin, van Buuren, Laurens D, Pinkse, Pepijn W H, Rempe, Gerhard
Format: Article
Language:English
Subjects:
Beamforming
Dependence
Electric fields
Filtration
Fluxes
Nozzles
Parameters
Velocity
Velocity distribution
Online Access:Get full text
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Summary:High fluxes of cold polar molecules are efficiently produced by electric guiding and velocity filtering. Here, we investigate different aspects of the beam formation. Variations of the source parameters such as density and temperature result in characteristic changes in the guided beam. These are observed in the velocity distribution of the guided molecules as well as in the dependence of the signal of guided molecules on the trapping electric field. A model taking into account velocity-dependent collisional losses of cold molecules in the region close to the nozzle accurately reproduces this behavior. This clarifies an open question on the parameter dependence of the detected signal and gives a more detailed understanding of the velocity filtering and guiding process.
ISSN:2331-8422
DOI:10.48550/arxiv.0812.2850