Initial-state correlation effects in low-energy proton impact ionization

Citation data:

AIP Conference Proceedings, ISSN: 0094-243X, Vol: 811, Page: 7-11

Publication Year:
2006
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Repository URL:
http://scholarsmine.mst.edu/phys_facwork/291
DOI:
10.1063/1.2165612
Author(s):
Foster, M.; Peacher, Jerry; Hasan, Ahmad; Schulz, Michael; Madison, Don H.
Publisher(s):
American Institute of Physics (AIP)
Tags:
Physics and Astronomy; Atom-Ion Collisions; Helium Neutral Atoms; Impact Ionisation; Numerical analysis; Atom-Ion Collisions; Helium Neutral Atoms; Impact Ionisation; Numerical analysis; Physics
conference paper description
In this paper, we will report on fully differential cross sections (FDCS) for single ionization of helium by 75 keV proton impact for fixed ejected electron energies and different momentum transfers. These measurements show major discrepancies in the absolute magnitude between experiment and the theoretical, 3DW (three-distorted-wave) model. The 3DW model treats the collision as a three-body process (projectile, ion, ejected electron), and for the scattering plane it has accurately predicted the FDCS for higher energy Cimpact ionization of helium. The lack of agreement between the 3DW model and experiment for low energy collisions suggests that a threebody model may not be appropriate for lower collision energies. We will present a four-body model that includes full initial-state correlation. © 2006 American Institute of Physics.