Correlation effects in differential electron-emission spectra obtained from double ionisation of He by fast Au53+ impact

T. Kirchner, L. Gulyás, R. Moshammer, M. Schulz, J. Ullrich

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We have measured and calculated doubly differential electron-emission cross sections (DDCS's) for well-defined degrees of target ionisation in 3.6 MeV/amu Au53++He collisions. The calculations are based on the continuum distorted wave with eikonal initial state approximation. We focus on DDCS's obtained in coincidence with double ionisation of the target, and investigate different models for the final two-electron continuum state. Whereas the results of an analysis within the independent particle model overestimate the experimental data badly, we find reduced DDCS's when electron correlation effects are included in a relatively simple fashion. The comparison between theoretical and experimental results indicates that the effective strength of the electron repulsion differs in close and distant collisions.

Original languageEnglish
Pages (from-to)479-483
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume205
DOIs
Publication statusPublished - May 2003

Fingerprint

Electron emission
electron emission
Ionization
emission spectra
ionization
cross sections
continuums
Electron correlations
electrons
collisions
Electrons
approximation

Keywords

  • Double ionisation
  • Electron correlation effects
  • Independent particle model
  • Ion-atom collisions
  • Two-electron continuum states

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Instrumentation
  • Surfaces and Interfaces

Cite this

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title = "Correlation effects in differential electron-emission spectra obtained from double ionisation of He by fast Au53+ impact",
abstract = "We have measured and calculated doubly differential electron-emission cross sections (DDCS's) for well-defined degrees of target ionisation in 3.6 MeV/amu Au53++He collisions. The calculations are based on the continuum distorted wave with eikonal initial state approximation. We focus on DDCS's obtained in coincidence with double ionisation of the target, and investigate different models for the final two-electron continuum state. Whereas the results of an analysis within the independent particle model overestimate the experimental data badly, we find reduced DDCS's when electron correlation effects are included in a relatively simple fashion. The comparison between theoretical and experimental results indicates that the effective strength of the electron repulsion differs in close and distant collisions.",
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T1 - Correlation effects in differential electron-emission spectra obtained from double ionisation of He by fast Au53+ impact

AU - Kirchner, T.

AU - Gulyás, L.

AU - Moshammer, R.

AU - Schulz, M.

AU - Ullrich, J.

PY - 2003/5

Y1 - 2003/5

N2 - We have measured and calculated doubly differential electron-emission cross sections (DDCS's) for well-defined degrees of target ionisation in 3.6 MeV/amu Au53++He collisions. The calculations are based on the continuum distorted wave with eikonal initial state approximation. We focus on DDCS's obtained in coincidence with double ionisation of the target, and investigate different models for the final two-electron continuum state. Whereas the results of an analysis within the independent particle model overestimate the experimental data badly, we find reduced DDCS's when electron correlation effects are included in a relatively simple fashion. The comparison between theoretical and experimental results indicates that the effective strength of the electron repulsion differs in close and distant collisions.

AB - We have measured and calculated doubly differential electron-emission cross sections (DDCS's) for well-defined degrees of target ionisation in 3.6 MeV/amu Au53++He collisions. The calculations are based on the continuum distorted wave with eikonal initial state approximation. We focus on DDCS's obtained in coincidence with double ionisation of the target, and investigate different models for the final two-electron continuum state. Whereas the results of an analysis within the independent particle model overestimate the experimental data badly, we find reduced DDCS's when electron correlation effects are included in a relatively simple fashion. The comparison between theoretical and experimental results indicates that the effective strength of the electron repulsion differs in close and distant collisions.

KW - Double ionisation

KW - Electron correlation effects

KW - Independent particle model

KW - Ion-atom collisions

KW - Two-electron continuum states

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JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

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