The three-body Coulomb problem has been explored in kinematically complete experiments on single ionization of helium by 100 MeV / u C 6 + and 3.6 MeV / u u 5 3 + impact. Low-energy electron emission (E e < 150 eV ) as a function of the projectile deflection ϑ p (momentum transfer), i.e., the Bethe surface [], has been mapped with Δ ϑ p ± 25 nanoradian resolution at extremely large perturbations (3.6 MeV / uAu53+ ) where single ionization occurs at impact parameters of typically 10 times the He K -shell radius. The experimental data are not in agreement with state-of-the-art continuum distorted wave-eikonal initial state theory.
R. Moshammer et al., "Three-Body Coulomb Problem Probed by Mapping the Bethe Surface in Ionizing Ion-Atom Collisions," Physical Review Letters, vol. 87, no. 22, pp. 223201/1-223201/4, American Physical Society (APS), Nov 2001.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.87.223201
Keywords and Phrases
Approximation theory; Continuum mechanics; Electron emission; Helium; Impact ionization; Kinematics; Perturbation techniques; Bethe surface; Ion atom collisions; Momentum transfer; Nanoradian resolution; Projectile deflection; Atomic physics
International Standard Serial Number (ISSN)
Article - Journal
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