Abstract

Two-photon double ionization of He is studied at the Free Electron Laser in Hamburg (FLASH) by inspecting He2+ momentum (P-(He 2+)) distributions at 52 eV photon energy. We demonstrate that recoil ion momentum distributions can be used to infer information about highly correlated electron dynamics and find the first experimental evidence for 'virtual sequential ionization'. The experimental data are compared with the results of two calculations, both solving the time-dependent Schrodinger equation. We find good overall agreement between experiment and theory, with significant differences for cuts along the polarization direction that cannot be explained by the experimental resolution alone.

Department(s)

Physics

Keywords and Phrases

Differential cross section; Dinger equation; Double ionization; Experimental data; Experimental evidence; Highly correlated electrons; Photon energy; Polarization direction; Recoil-ion momentum distribution; Sequential ionization; Time-dependent; Two-photon double ionization; Free electron lasers; Particle detectors; Photoionization

International Standard Serial Number (ISSN)

1367-2630

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2010 Institute of Physics - IOP Publishing, All rights reserved.

Included in

Physics Commons

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