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Accurate determination of the rotational constants of ultracold molecules using double photoassociation spectroscopy

Optics Express, ISSN: 1094-4087, Vol: 22, Issue: 4, Page: 3754-3760
2014
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We report on an accurate determination of the rotational constants of the ultracold long-range Cesium molecules in near dissociation domain. The scheme relies on a precise reference of the frequency difference in a double photoassociation spectroscopy induced by two laser beams based on an acoustic-optical modulator. The rotational constants are obtained by fitting a non-rigid rotor model into the frequency intervals of the neighboring rotational levels deduced from the reference. © 2014 Optical Society of America.

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