Double ionization of helium by fast ion impact: Reexamination of the correlation function

L. Gulyás, A. Igarashi, T. Kirchner

Research output: Contribution to journalArticle

12 Citations (Scopus)


The recently introduced correlation function [M. Schulz, Phys. Rev. Lett. 84, 863 (2000)] for the analysis of double ionization processes is reconsidered. We present a model based on the frozen-correlation and continuum distorted-wave with eikonal initial-state approximations, and compare numerical results with experimental data for double ionization in 100 MeVamu C6+ -He and 3.6 MeVamu Au53+ -He collisions. Our calculations confirm earlier conclusions about the primary and secondary roles of final-state and initial-state correlations, respectively. However, we show that the usual definition of the correlation function on the level of cross sections is problematic, since even a fully uncorrelated calculation gives rise to a nontrivial result. The intended limit of a zero-valued function for an independent electron calculation is achieved only if the analysis is performed on the level of impact-parameter dependent transition probabilities. Consequently, the workings of initial- and final-state correlations are reflected unambiguously only on this level.

Original languageEnglish
Article number032713
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number3
Publication statusPublished - Oct 9 2006

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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