We present a systematic study of atomic four-body fragmentation dynamics. To this end we have measured a variety of multiple differential double ionization cross sections for 6 MeV p+He collisions. The data are compared to a first-order calculation with correlated electrons and to a simulation representing a second-order process, with some experimental results seemingly in favor of the first, others in agreement with the second approach. This apparent conflict can be resolved by accounting for elastic scattering between the projectile and one electron already promoted to the continuum through electron-electron correlation in the first-order process.
M. Schulz et al., "Role of Elastic Projectile-Electron Scattering in Double Ionization of Helium by Fast Proton Impact," Physical Review A, vol. 79, no. 4, pp. 042708-1-042708-7, American Physical Society (APS), Apr 2009.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevA.79.042708
German Research Association
National Science Foundation (U.S.)
Keywords and Phrases
Electron Correlations; Electron Impact Ionisation; Helium Neutral Atoms; Electron-atom collisions
International Standard Serial Number (ISSN)
Article - Journal
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