Abstract

Few-photon multiple ionization of Ne and Ar atoms by strong vacuum ultraviolet laser pulses from the free-electron laser at Hamburg was investigated differentially with the Heidelberg reaction microscope. The light-intensity dependence of Ne2+ production reveals the dominance of nonsequential two-photon double ionization at intensities of I< 6 x 1012W/cm2 and significant contributions of three-photon ionization as I increases. Ne2+ recoil-ion-momentum distributions suggest that two electrons absorbing "instantaneously" two photons are ejected most likely into opposite hemispheres with similar energies.

Department(s)

Physics

Keywords and Phrases

Argon; Electron Absorption; Free Electron Lasers; Laser Pulses; Neon; Ultraviolet Radiation; Heidelberg Reaction Microscope; Two Photon Double Ionization; Ultraviolet Laser Pulses; Photoionization

International Standard Serial Number (ISSN)

0031-9007

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2007 American Physical Society (APS), All rights reserved.

Publication Date

01 May 2007

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Physics Commons

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