Recently, three-dimensional imaging of the ejected electrons following 100 MeV/amu C6+ single ionization of helium led to the observation of a new structure not predicted by theory [M. Schulz et al., Nature (London) 422, 48 (2003)]. Instead of the usual “recoil lobe” centered on the momentum-transfer axis, a ring-shaped structure centered on the beam axis was observed. New measurements at 2 MeV/amu exhibit a similar structure, which is now predicted by theory. We argue that the same theory failed at 100 MeV/amu because the faster projectiles probe distances much closer to the nucleus, where our multiple-scattering model is expected to break down.
D. H. Madison et al., "Probing Scattering Wave Functions Close to the Nucleus," Physical Review Letters, vol. 91, no. 25, pp. 2532011-2532014, American Physical Society (APS), Dec 2003.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevLett.91.253201
Keywords and Phrases
Approximation theory; Electrons; Functions; Heavy ions; Ionization; Matrix algebra; Quantum theory; Electron impact ionization; First Born approximation (FBA); Atomic physics
International Standard Serial Number (ISSN)
Article - Journal
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