High-resolution storage-ring measurements of the dissociative recombination of H3+ using a supersonic expansion ion source

Holger Kreckel, Oldřich Novotný, Kyle N. Crabtree, Henrik Buhr, Annemieke Petrignani, Brian A. Tom, Richard D. Thomas, Max H. Berg, Dennis Bing, Manfred Grieser, Claude Krantz, Michael Lestinsky, Mario B. Mendes, Christian Nordhorn, Roland Repnow, Julia Stützel, Andreas Wolf, and Benjamin J. McCall
Phys. Rev. A 82, 042715 – Published 25 October 2010

Abstract

We have performed measurements of the dissociative electron recombination (DR) of H3+ at the ion storage ring TSR utilizing a supersonic expansion ion source. The ion source has been characterized by continuous wave cavity ring-down spectroscopy. We present high-resolution DR rate coefficients for different nuclear spin modifications of H3+ combined with precise fragment imaging studies of the internal excitation of the H3+ ions inside the storage ring. The measurements resolve changes in the energy dependence between the ortho-H3+ and para-H3+ rate coefficients at low center-of-mass collision energies. Analysis of the imaging data indicates that the stored H3+ ions may have higher rotational temperatures than previously assumed, most likely due to collisional heating during the extraction of the ions from the ion source. Simulations of the ion extraction shed light on possible origins of the heating process and how to avoid it in future experiments.

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  • Received 14 July 2010

DOI:https://doi.org/10.1103/PhysRevA.82.042715

©2010 American Physical Society

Authors & Affiliations

Holger Kreckel1,*, Oldřich Novotný2, Kyle N. Crabtree1, Henrik Buhr4,3, Annemieke Petrignani3, Brian A. Tom1,†, Richard D. Thomas5, Max H. Berg3, Dennis Bing3, Manfred Grieser3, Claude Krantz3, Michael Lestinsky2, Mario B. Mendes3, Christian Nordhorn3, Roland Repnow3, Julia Stützel3, Andreas Wolf3, and Benjamin J. McCall1,6

  • 1Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 2Columbia Astrophysics Laboratory, 550 West 120th Street, New York, New York 10027, USA
  • 3Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany
  • 4Faculty of Physics, Weizmann Institute of Science, Rehovot 76100, Israel
  • 5Department of Physics, Stockholm University, Alba Nova, S-106 91 Stockholm, Sweden
  • 6Department of Astronomy, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA

  • *hkreckel@illinois.edu
  • Present address: Department of Chemistry, United States Air Force Academy, CO 80840, USA.

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Vol. 82, Iss. 4 — October 2010

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