Fully Differential Cross Sections for C⁶⁺ Single Ionization of Helium
We have examined the fully differential cross section (FDCS) for single ionization of helium by a 2 MeV amu-1 C6+ ion. The FDCS is presented for a variety of momentum transfers and ejected electron energies. The theoretical model we use, labelled 3DW-EIS (three-body distorted wave-eikonal initial state), treats the collision as a three-body problem (projectile, active electron, residual ion). In the final state, each two-particle pair is treated exactly and the initial state is an eikonal state which contains the proper asymptotic forms of the projectile-target ion and projectile-electron interactions. Most importantly, the final state of the ejected electron is treated as a distorted wave calculated numerically from the static Hartree-Fock potential for the ion. Our theoretical results are compared with both absolute experimental measurements and previous theoretical calculations. It is shown that the 3DW-EIS results are in good agreement with experiment for all cases except large momentum transfer and low ejected-electron energies.
M. Foster et al., "Fully Differential Cross Sections for C⁶⁺ Single Ionization of Helium," Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 37, no. 8, pp. 1565-1580, Institute of Physics - IOP Publishing, Apr 2004.
The definitive version is available at http://dx.doi.org/10.1088/0953-4075/37/8/001
German Research Association
National Science Foundation (U.S.)
Keywords and Phrases
Approximation theory; Electrons; Ionization; Perturbation techniques; Projectiles; Scattering; Spectrometers; Fully differential cross section (FDCS); Momentum transfer; Projectile energy; Helium
Library of Congress Subject Headings
International Standard Serial Number (ISSN)
Article - Journal
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