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Review of Scientific Instruments / Volume 79 / Issue 10 / OPTICS; ATOMS AND MOLECULES; SPECTROSCOPY; PHOTON DETECTORS

Rev. Sci. Instrum. 79, 103102 (2008); http://dx.doi.org/10.1063/1.2994151 (11 pages)

A new magneto-optical trap-target recoil ion momentum spectroscopy apparatus for ion-atom collisions and trapped atom studies

J. Blieck1, X. Fléchard1, A. Cassimi2, H. Gilles2, S. Girard2, and D. Hennecart2

1LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, Caen 14050, France
2CIMAP, ENSICAEN, CNRS, CEA, Université de Caen, Caen 14050, France

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(Received 21 July 2008; accepted 13 September 2008; published online 9 October 2008)

A new magneto-optical trap-target recoil ion momentum spectroscopy apparatus has been built and tested at the LPC-CAEN. Dedicated to ion-atom collisions studies and excited fraction measurements, the setup combines a projectile ion beam line, a target of cold rubidium atoms provided by a magneto-optical trap (MOT), and a recoil ion momentum spectrometer. In a test experiment using a beam of Na+ projectiles, we demonstrate its capability to measure, with a very high signal over background ratio, fully differential cross sections in scattering angle, initial state, and final state of the system. We detail, in this work, features that had not been described previously in the literature: an extraction of the recoil ions transverse to the ion beam axis, and a fast switch for the MOT magnetic field. Advantages of transverse versus longitudinal extraction are discussed, and future possibilities for the setup are presented.

© 2008 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL SETUP
    1. The magneto-optical trap
      1. The laser system
      2. MOT characteristics
      3. The B -field fast switch
    2. The projectile beam line
    3. The recoil ion spectrometer
      1. The recoil ion detector
      2. Simulations of the spectrometer
    4. Timing and data acquisition system
  3. SAMPLE RESULTS
    1. Counting rates and background
    2. B -field and AOM switches
    3. Fully differential cross sections
  4. CONCLUSION

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KEYWORDS and PACS

Keywords

atom-ion collisions, magneto-optical effects, positive ions, radiation pressure, rubidium, sodium

PACS

  • 33.57.+c

    Magneto-optical and electro-optical spectra and effects

  • 34.50.-s

    Scattering of atoms and molecules

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2994151

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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