Spectroscopy of ultracold trapped cesium Feshbach molecules Journal Article

Author(s): Mark, Michael J; Ferlaino, Francesca; Knoop, Steven; Danzl, Johannes G; Kraemer, Tobias; Chin, Cheng; Nägerl, Hanns C; Grimm, Rudolf
Article Title: Spectroscopy of ultracold trapped cesium Feshbach molecules
Abstract: We explore the rich internal structure of Cs2 Feshbach molecules. Pure ultracold molecular samples are prepared in a CO2 -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.
Keywords: Cesium; Angular momentum; Feshbach molecules; Resonance; ultracold molecules; Binding energy; Carbon dioxide lasers; Magnetic moments; Microwave spectroscopy; Molecular states
Journal Title: Physical Review A - Atomic, Molecular, and Optical Physics
Volume: 76
Issue 4
ISSN: 1094-1622
Publisher: American Physical Society  
Date Published: 2007-10-25
DOI: 10.1103/PhysRevA.76.042514
Notes: The authors thank E. Tiesinga, P. Julienne, and C. Williams for providing invaluable theoretical input and J. Hutson and A. Simoni for helpful discussions. The authors acknowledge support by the Austrian Science Fund (FWF) within SFB 15 (project part 16) and by the European Union within the Cold Molecules TMR Network under Contract No. HPRN-CT-2002-00290. One of the authors (M.M.) acknowledges support within the Ph.D. program DOC of the Austrian Academy of Sciences, and two of the authors (F.F., C.C.) acknowledge support within the Lise Meitner program of the FWF. One of the authors (S.K.) is supported by the European Community, Marie Curie Intra-European program.
Open access: yes (repository)
IST Austria Authors
  1. Johann Danzl
    31 Danzl
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