---
_id: '1039'
abstract:
- lang: eng
text: 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.
acknowledgement: " We thank the team of J. Hecker Denschlag, the LevT team in our
group, and T. Bergeman for very helpful discussions and M. Prevedelli for technical
assistance. We are indebted to R. Grimm for generous support and gratefully acknowledge
funding by the Austrian Ministry of Science and Research (Bundesministerium für
Wissenschaft und Forschung) and the Austrian Science Fund (Fonds zur Förderung der
wissenschaftlichen Forschung) in the form of a START prize grant and by the European
Science Foundation in the framework of the EuroQUAM collective research project
QuDipMol.\r\n"
article_processing_charge: No
author:
- first_name: Johann G
full_name: Danzl, Johann G
id: 42EFD3B6-F248-11E8-B48F-1D18A9856A87
last_name: Danzl
orcid: 0000-0001-8559-3973
- first_name: Elmar
full_name: Haller, Elmar
last_name: Haller
- first_name: Mattias
full_name: Gustavsson, Mattias
last_name: Gustavsson
- first_name: Manfred
full_name: Mark, Manfred
last_name: Mark
- first_name: Russell
full_name: Hart, Russell
last_name: Hart
- first_name: Nadia
full_name: Bouloufa, Nadia
last_name: Bouloufa
- first_name: Olivier
full_name: Dulieu, Olivier
last_name: Dulieu
- first_name: Helmut
full_name: Ritsch, Helmut
last_name: Ritsch
- first_name: Hanns
full_name: Nägerl, Hanns
last_name: Nägerl
citation:
ama: Danzl JG, Haller E, Gustavsson M, et al. Quantum gas of deeply bound ground
state molecules. Science. 2008;321(5892):1062-1066. doi:10.1126/science.1159909
apa: Danzl, J. G., Haller, E., Gustavsson, M., Mark, M., Hart, R., Bouloufa, N.,
… Nägerl, H. (2008). Quantum gas of deeply bound ground state molecules. Science.
American Association for the Advancement of Science. https://doi.org/10.1126/science.1159909
chicago: Danzl, Johann G, Elmar Haller, Mattias Gustavsson, Manfred Mark, Russell
Hart, Nadia Bouloufa, Olivier Dulieu, Helmut Ritsch, and Hanns Nägerl. “Quantum
Gas of Deeply Bound Ground State Molecules.” Science. American Association
for the Advancement of Science, 2008. https://doi.org/10.1126/science.1159909.
ieee: J. G. Danzl et al., “Quantum gas of deeply bound ground state molecules,”
Science, vol. 321, no. 5892. American Association for the Advancement of
Science, pp. 1062–1066, 2008.
ista: Danzl JG, Haller E, Gustavsson M, Mark M, Hart R, Bouloufa N, Dulieu O, Ritsch
H, Nägerl H. 2008. Quantum gas of deeply bound ground state molecules. Science.
321(5892), 1062–1066.
mla: Danzl, Johann G., et al. “Quantum Gas of Deeply Bound Ground State Molecules.”
Science, vol. 321, no. 5892, American Association for the Advancement of
Science, 2008, pp. 1062–66, doi:10.1126/science.1159909.
short: J.G. Danzl, E. Haller, M. Gustavsson, M. Mark, R. Hart, N. Bouloufa, O. Dulieu,
H. Ritsch, H. Nägerl, Science 321 (2008) 1062–1066.
date_created: 2018-12-11T11:49:49Z
date_published: 2008-08-22T00:00:00Z
date_updated: 2021-01-12T06:47:50Z
day: '22'
doi: 10.1126/science.1159909
extern: '1'
external_id:
arxiv:
- '0806.2284'
intvolume: ' 321'
issue: '5892'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/0806.2284
month: '08'
oa: 1
oa_version: None
page: 1062 - 1066
publication: Science
publication_status: published
publisher: American Association for the Advancement of Science
publist_id: '6351'
status: public
title: Quantum gas of deeply bound ground state molecules
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 321
year: '2008'
...