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Phys. Rev. A 73, 023401 (2006) [13 pages]

Transverse stability in a Stark decelerator

Sebastiaan Y. T. van de Meerakker,1,2 Nicolas Vanhaecke,1 Hendrick L. Bethlem,1,2 and Gerard Meijer1
1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
2FOM-Institute for Plasmaphysics Rijnhuizen, Edisonbaan 14, 3439 MN Nieuwegein, The Netherlands

Received 28 April 2005; revised 8 November 2005; published 1 February 2006

The concept of phase stability in a Stark decelerator ensures that polar molecules can be accelerated, guided, or decelerated without loss; molecules within a certain position and velocity interval are kept together throughout the deceleration process. In this paper the influence of the transverse motion on phase stability in a Stark decelerator is investigated. For typical deceleration experiments—i.e., for high values of the phase angle phi0—the transverse motion considerably enhances the region in phase space for which phase stable deceleration occurs. For low values of phi0, however, the transverse motion reduces the acceptance of a Stark decelerator and unstable regions in phase space appear. These effects are quantitatively explained in terms of a coupling between the longitudinal and transverse motion. The predicted longitudinal acceptance of a Stark decelerator is verified by measurements on a beam of OH (X  2Pi3/2,J=3/2) radicals passing through a Stark decelerator.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.73.023401
DOI: 10.1103/PhysRevA.73.023401
PACS: 33.80.Ps; 33.55.Be; 39.10.+j
  • 33.80.Ps
    Optical cooling of molecules; trapping
  • 33.55.Be
    Zeeman and Stark effects (molecules)
  • 39.10.+j
    Atomic and molecular beam sources and techniques
  • YEAR: 2006
KEYWORDS: Stark effect, molecule-photon collisions, molecular beams

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