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., 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 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.
DOI: http://dx.doi.org/10.1103/PhysRevA.72.0227267 More
- Received 13 November 2004
- Published 29 August 2005
© 2005 The American Physical Society