Quantum gas of deeply bound ground state molecules

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Danzl, J.G. and Haller, Elmar and Gustavsson, M. and Mark, M.J. and Hart, R. and Bouloufa, N. and Dulieu, O. and Ritsch, H. and Nägerl, H.-C. (2008) Quantum gas of deeply bound ground state molecules. Science, 321 (5892). pp. 1062-1066. ISSN 0036-8075 (https://doi.org/10.1126/science.1159909)

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Abstract

Molecular cooling techniques face the hurdle of dissipating translational as well as internal energy in the presence of a rich electronic, vibrational, and rotational energy spectrum. In our experiment, we create a translationally ultracold, dense quantum gas of molecules bound by more than 1000 wave numbers in the electronic ground state. Specifically, we stimulate with 80% efficiency, a two- photon transfer of molecules associated on a Feshbach resonance from a Bose- Einstein condensate of cesium atoms. In the process, the initial loose, long- range electrostatic bond of the Feshbach molecule is coherently transformed into a tight chemical bond. We demonstrate coherence of the transfer in a Ramsey- type experiment and show that the molecular sample is not heated during the transfer. Our results show that the preparation of a quantum gas of molecules in specific rovibrational states is possible and that the creation of a Bose- Einstein condensate of molecules in their rovibronic ground state is within reach.

ORCID iDs

Danzl, J.G., Haller, Elmar ORCID logoORCID: https://orcid.org/0000-0002-7951-1721, Gustavsson, M., Mark, M.J., Hart, R., Bouloufa, N., Dulieu, O., Ritsch, H. and Nägerl, H.-C.;
  • Item type:Article
    ID code:43320
    Dates:
    Date
    Event
    22 August 2008
    Published
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:26 Mar 2013 09:37
    Last modified:24 Nov 2024 09:38
    URI:https://strathprints.strath.ac.uk/id/eprint/43320
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