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Prospects for sympathetic cooling of molecules in electrostatic, ac and microwave traps

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  • Cold and ultracold molecules
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Abstract

We consider how trapped molecules can be sympathetically cooled by ultracold atoms. As a prototypical system, we study LiH molecules co-trapped with ultracold Li atoms. We calculate the elastic and inelastic collision cross sections of 7LiH + 7Li with the molecules initially in the ground state and in the first rotationally excited state. We then use these cross sections to simulate sympathetic cooling in a static electric trap, an ac electric trap, and a microwave trap. In the static trap we find that inelastic losses are too great for cooling to be feasible for this system. The ac and microwave traps confine ground-state molecules, and so inelastic losses are suppressed. However, collisions in the ac trap can take molecules from stable trajectories to unstable ones and so sympathetic cooling is accompanied by trap loss. In the microwave trap there are no such losses and sympathetic cooling should be possible.

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Authors and Affiliations

  1. Centre for Cold Matter, Blackett Laboratory, Imperial College London, Prince Consort Road, London, SW7 2AZ, UK

    S. K. Tokunaga, E. A. Hinds & M. R. Tarbutt

  2. Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland

    W. Skomorowski & R. Moszynski

  3. Department of Chemistry, Durham University, South Road, DH1 3LE, Durham, UK

    P. S. Żuchowski & J. M. Hutson

Authors
  1. S. K. Tokunaga
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  2. W. Skomorowski
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  3. P. S. Żuchowski
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  4. R. Moszynski
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  5. J. M. Hutson
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  6. E. A. Hinds
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  7. M. R. Tarbutt
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Correspondence to M. R. Tarbutt.

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Tokunaga, S.K., Skomorowski, W., Żuchowski, P.S. et al. Prospects for sympathetic cooling of molecules in electrostatic, ac and microwave traps. Eur. Phys. J. D 65, 141–149 (2011). https://doi.org/10.1140/epjd/e2011-10719-x

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  • DOI: https://doi.org/10.1140/epjd/e2011-10719-x

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