Abstract

We report on an experimental and theoretical systematic study of double ionization of helium by ion impact in terms of four-particle Dalitz plots. Several collision systems covering abroad range of perturbation parameters η (projectile charge to speed ratio) were investigated. With increasing η we observe a systematic trend from features, characteristic to correlated double-ionization mechanisms, to signatures of higher-order processes not requiring electron-electron correlations [the mechanism called "two-step-two projectile-electron interaction" (TS-2)]. The data for the largest η can qualitatively be amazingly well described by a simple model only including the TS-2 mechanism.

Department(s)

Physics

Keywords and Phrases

Collision Systems; Double Ionization; Double-ionization Dynamics; Electron Interaction; Electron-electron Correlation; Higher-order Process; Ion Impact; Ionization Mechanisms; Perturbation Parameters; Projectile Charge; Simple Model; Speed Ratio; Systematic Analysis; Systematic Study; Helium; Ion Bombardment; Particle Detectors

International Standard Serial Number (ISSN)

1050-2947

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2009 American Physical Society (APS), All rights reserved.

Included in

Physics Commons

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