Berlin 2001 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
A: Atomphysik
A 10: Posters Wednesday (Cooling and Trapping, Electron Scattering and Recombination)
A 10.11: Poster
Mittwoch, 4. April 2001, 12:30–15:00, AT3
Complete (e,3e) experiments for the double ionization of Helium. — •Lahmam-Bennani A.1, Duguet A.1, Gaboriaud M.N.1, Taouil I.1, Lecas M.1, Kheifets A.2, Berakdar J.3, and Dal Cappello C.4 — 1LCAM, UMR 8625, Bat. 351, Univ. Paris-Sud, 91405 Orsay, FRANCE — 2Research School of Physical Sciences, The Austr. Nat. Univ., Canberra ACT 0200, AUSTRALIA — 3Max-Planck Instit., Weinberg 2, 06120 Halle, GERMANY — 4Instit. Physique, LPMC, 1 Bd Arago, Technopole 2000, 57078 Metz, FRANCE
The study of angle and energy resolved multiply differential (e,3e) cross sections for the electron impact double ionization (DI) process is fundamental to understand the dynamical e - e correlation during the collision. Such study yields the ultimate information obtainable on the collision dynamics, and provides the most sensitive probe for theoretical approaches. The promise in the theoretical investigations of these processes lie in the modeling and understanding of the inherently non-separable many-body interacting systems in the final state.
For this purpose, the ideal target is helium [1], the simplest two-electron system which leads to a pure four-body final state. We have measured full sets of coplanar (e,3e) angular distributions for DI of He [2] at 1.1 keV impact energy and equal ejection energies, 10 eV. Comparison is made with photo-DI, and with first order theoretical models : the BBK model, the convergent close coupling model and the correlated four-body final-state model.
[1] I. Taouil et al, Phys. Rev. Lett. 81 4600 (1998).
[2] A. Lahmam-Bennani et al, J. Phys. B submitted (2001).