Double Ionization of Helium by Impact of Particles with Positive and Negative Charge
Double ionization of helium in collisions with 6 MeV protons (vP = 15.5 a.u.) has been explored in a kinematically complete experiment using a so-called "reaction microscope". For the first time fully differential cross sections for positively charged particle impact have been obtained and compared to previous (e,3e) results with 2 keV electrons (vP = 12 a.u.). Differences have been found in the angular distribution of the two emitted electrons, which originate from projectile charge effects that are not considered in the first Born approximation
D. Fischer and R. Moshammer and A. Dorn and J. R. Crespo Lopez-Urrutia and B. Feuerstein and C. Hohr and C. D. Schroter and S. Hagmann and H. Kollmus and R. Mann and B. Bapat and J. H. Ullrich, "Double Ionization of Helium by Impact of Particles with Positive and Negative Charge," AIP Conference Proceedings, vol. 697, no. 1, pp. 65-69, American Institute of Physics (AIP), Jul 2003.
The definitive version is available at http://dx.doi.org/10.1063/1.1643679
Twelfth International Symposium on Polarization and Correlation in Electronic and Atomic Collisions (2003: Jul. 30-Aug. 2, Konigstein, Germany)
Article - Conference proceedings
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