Electron Charge Exchange Cross Sections At Very Low Energies

Chris Verzani, Lew Cocke
(J.R. Macdonald Laboratory, Department of Physics, Kansas State University)

Kazuhiko Okuno
(Department of Physics, Tokyo Metropolitan University)

Charles Fehrenbach, Brett D. DePaola
(J.R. Macdonald Laboratory, Department of Physics, Kansas State University)

An experiment is described in which an octopole ion-beam guide (OPIG) technique is used in conjunction with the Kansas State University (KSU) Cryogenic Electron Beam Ion Source (CRYEBIS), to facilitate the study of low energy collisions. An r-f field applied to the OPIG confines the radial motion of the ions, without affecting the motion along the central beam axis. The OPIG is floated on a DC potential in order to decelerate the projectile ions to the desired collision velocity. Using an OPIG, the product projectile ions are guided along the beam axis in the downstream direction. After exiting the OPIG these ions are re-accelerated, and focused using a quadropole lens system. The different charge states are magnetically charge state analyzed and detected on a position sensitive detector which is capable of simultaneously measuring the ions from the primary beam, and the single and double electron capture. Cross section measurements for collision energies ranging from a few eV/amu to a few hundred eV/amu will be presented.

This work was supported by the Chemical Sciences, Geosciences and Biosciences Division,
Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy.

Submitted to DAMOP 2002, May 2002 in Williamsburg, VA.

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