Two-electron cusp in the double ionization of helium

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.032705· OSTI ID:21450557

Gulyas, L; Sarkadi, L; Igarashi, A; Kirchner, T ^[1]

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1. Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), H-4001 Debrecen, Post Office Box 51 (Hungary)

We analyze the double ionization of He under the impact of 100 keV He{sup 2+} projectiles. The process is described within the framework of the impact parameter and frozen-correlation approximations where the one-electron events are treated by the continuum distorted wave method. Correlation between the emitted electrons, which plays an important role in forming the shape of the differential distribution of the electron emission, is described by the Coulomb density of states approximation (CDS). Special attention is paid to the region of the two-electron cusp that has been observed in a recent experiment for 100 keV He{sup 0}+He collisions [L. Sarkadi and A. Orban, Phys. Rev. Lett. 100, 133201 (2008)]. In the cusp region the correlated motion of the two electrons is influenced dominantly by the outgoing projectile, that is, the correlation function of the CDS treatment is expected to depend on the electron momenta measured relative to the projectile rather than to the target nucleus. A qualitative agreement with the experiment is achieved with a CDS model based on the use of such a projectile-centered correlation function that applies effective charges as given in the dynamically screened three-Coulomb wave function.

• OSTI ID: 21450557
• Journal Information: Physical Review. A, Vol. 82, Issue 3; Other Information: DOI: 10.1103/PhysRevA.82.032705; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
APPROXIMATIONS
CORRELATION FUNCTIONS
CORRELATIONS
COULOMB FIELD
DISTORTED WAVE THEORY
EFFECTIVE CHARGE
ELECTRON EMISSION
ELECTRONS
ENERGY-LEVEL DENSITY
HELIUM
HELIUM IONS
IMPACT PARAMETER
ION-ATOM COLLISIONS
IONIZATION
KEV RANGE
WAVE FUNCTIONS
ATOM COLLISIONS
CALCULATION METHODS
CHARGED PARTICLES
COLLISIONS
ELECTRIC FIELDS
ELEMENTARY PARTICLES
ELEMENTS
EMISSION
ENERGY RANGE
FERMIONS
FLUIDS
FUNCTIONS
GASES
ION COLLISIONS
IONS
LEPTONS
NONMETALS
RARE GASES