Spectroscopy of ultracold trapped cesium Feshbach molecules

Journal Article · Mon Oct 15 00:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.042514· OSTI ID:21020720

Mark, M; Knoop, S; Danzl, J G; Kraemer, T; Naegerl, H -C ^[1]; Ferlaino, F ^[1]; Chin, C ^[2]; Grimm, R ^[1]

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1. Institut fuer Experimentalphysik and Forschungszentrum fuer Quantenphysik, Universitaet Innsbruck, 6020 Innsbruck (Austria)
2. Physics Department and James Franck Institute, University of Chicago, Chicago, Illinois 60637 (United States)

We explore the rich internal structure of Cs{sub 2} Feshbach molecules. Pure ultracold molecular samples are prepared in a CO{sub 2}-laser trap, and a multitude of weakly bound states is populated by elaborate magnetic-field ramping techniques. Our methods use different Feshbach resonances as input ports and various internal level crossings for controlled state transfer. We populate higher partial-wave states of up to eight units of rotational angular momentum (l-wave states). We investigate the molecular structure by measurements of the magnetic moments for various states. Avoided level crossings between different molecular states are characterized through the changes in magnetic moment and by a Landau-Zener tunneling method. Based on microwave spectroscopy, we present a precise measurement of the magnetic-field-dependent binding energy of the weakly bound s-wave state that is responsible for the large background scattering length of Cs. This state is of particular interest because of its quantum-halo character.

• OSTI ID: 21020720
• Journal Information: Physical Review. A, Vol. 76, Issue 4; Other Information: DOI: 10.1103/PhysRevA.76.042514; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR MOMENTUM
BINDING ENERGY
BOUND STATE
CARBON DIOXIDE LASERS
CESIUM
MAGNETIC FIELDS
MAGNETIC MOMENTS
MICROWAVE RADIATION
MICROWAVE SPECTRA
MOLECULAR STRUCTURE
MOLECULES
POTENTIAL ENERGY
S WAVES
SCATTERING LENGTHS
SEISMIC SURFACE WAVES
SPECTROSCOPY
TEMPERATURE RANGE 0000-0013 K
TRAPPING
TRAPS
TUNNEL EFFECT