Proton–carbon monoxide collisions from 10 keV to 14 MeV

Phys. Rev. A 72, 022726 – Published 29 August 2005
E. Wells, Vidhya Krishnamurthi, K. D. Carnes, Nora G. Johnson, Heather D. Baxter, David Moore, Kristana M. Bloom, B. M. Barnes, H. Tawara, and I. Ben-Itzhak


We have measured relative cross sections and fragmentation branching ratios for proton–carbon monoxide collisions over a wide velocity range from 0.63 to 23.7 a.u. (i.e., Ep of 10 keV to 14 MeV) using a coincidence time-of-flight technique. For low projectile velocity, where electron capture by the projectile becomes important, this process is separated from ionization by projectile charge-state analysis. Our measurements of CO2+ production resolve differences between previous measurements, but our multiple-ionization cross-section measurements differ significantly from recent measurements by Siegmann et al. [Phys. Rev. A 66, 052701 (2002)]. The observed kinetic-energy release from dissociating channels varies slowly as the incident proton velocity changes, and in general is not compatible with a simple Coulomb explosion picture.


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  • Received 13 November 2004
  • Published 29 August 2005

© 2005 The American Physical Society

Authors & Affiliations

E. Wells1,2, Vidhya Krishnamurthi1, K. D. Carnes1, Nora G. Johnson2, Heather D. Baxter2, David Moore1, Kristana M. Bloom1, B. M. Barnes1,†, H. Tawara1,3,‡, and I. Ben-Itzhak1,*

  • 1J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA
  • 2Department of Physics, Augustana College, Sioux Falls, South Dakota 57197, USA
  • 3National Institute for Fusion Sciences, Nagoya 464-01, Japan

  • *Electronic address:
  • Present address: Department of Physics, University of Wisconsin, Madison, WI 53706, USA.
  • Present address: Max-Planck-Institut für Kernphysik, D-69029 Heidelberg, Germany.

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