Abstract
Language | English |
---|---|
Pages | 1062-1066 |
Number of pages | 5 |
Journal | Science |
Volume | 321 |
Issue number | 5892 |
DOIs | |
Publication status | Published - 22 Aug 2008 |
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Keywords
- molecular cooling
- quantum gas
- Bose-Einstein condensate
- cesium atoms
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Quantum gas of deeply bound ground state molecules. / Danzl, J.G.; Haller, Elmar; Gustavsson, M.; Mark, M.J.; Hart, R.; Bouloufa, N.; Dulieu, O.; Ritsch, H.; Nägerl, H.-C.
In: Science, Vol. 321, No. 5892, 22.08.2008, p. 1062-1066.Research output: Contribution to journal › Article
TY - JOUR
T1 - Quantum gas of deeply bound ground state molecules
AU - Danzl, J.G.
AU - Haller, Elmar
AU - Gustavsson, M.
AU - Mark, M.J.
AU - Hart, R.
AU - Bouloufa, N.
AU - Dulieu, O.
AU - Ritsch, H.
AU - Nägerl, H.-C.
PY - 2008/8/22
Y1 - 2008/8/22
N2 - 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.
AB - 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.
KW - molecular cooling
KW - quantum gas
KW - Bose-Einstein condensate
KW - cesium atoms
U2 - 10.1126/science.1159909
DO - 10.1126/science.1159909
M3 - Article
VL - 321
SP - 1062
EP - 1066
JO - Science
T2 - Science
JF - Science
SN - 0036-8075
IS - 5892
ER -