Two-particle versus three-particle interactions in single ionization of helium by ion impact

Citation data:

Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN: 0953-4075, Vol: 37, Issue: 20, Page: 4055-4067

Publication Year:
2004
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Citations 23
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Repository URL:
http://scholarsmine.mst.edu/phys_facwork/38
DOI:
10.1088/0953-4075/37/20/002
Author(s):
Schulz, Michael; Moshammer, R.; Fischer, Daniel; Ullrich, J.
Publisher(s):
IOP Publishing; Institute of Physics - IOP Publishing
Tags:
Physics and Astronomy; Approximation theory; Boundary conditions; Continuum mechanics; Couplings; Data reduction; Hamiltonians; Ionization; Perturbation techniques; Collision fragments; Cross sections; Kinematic conditions; Particle interactions; Helium; Approximation theory; Boundary conditions; Continuum mechanics; Couplings; Data reduction; Hamiltonians; Ionization; Perturbation techniques; Collision fragments; Cross sections; Kinematic conditions; Particle interactions; Helium; Physics
article description
We have performed kinematically complete experiments on single ionization of He by 100 MeV amu C and 3.6 MeV amu Au impact. By analysing doubly differential cross sections (DDCS) as a function of the momenta of all two-particle sub-systems we studied the importance of two-particle interactions. Furthermore, presenting the squared momenta of all three collision fragments simultaneously in a Dalitz plot, we evaluated the role of three-particle interactions. Finally, both for the DDCS and the Dalitz plots the corresponding correlation function was analysed. While the absolute cross sections confirm that ionization predominantly leads to a momentum exchange between the electron and the recoil-ion, the correlation function reveals strong correlations between the particles of any two-particle sub-system. Three-particle correlations, which are not accounted for by perturbative calculations, are quite significant as well, at least for certain kinematic conditions.