Recoil-Ion Momentum Distributions for Two-Photon Double Ionization of He and Ne by 44 eV Free-Electron Laser Radiation

Autor:	K. U. Kühnel, R. Treusch, Markus Schöffler, W Li, Yuhai Jiang, Artem Rudenko, T. Havermeier, M. Smolarski, S. Schössler, Michael Gensch, R. Moshammer, Anatoli Kheifets, Reinhard Dörner, Bennaceur Najjari, S. Ludemann, C. D. Schröter, Alexander Voitkiv, Th. Ergler, B Keitel, M. Kurka, Joachim Ullrich, K. Cole, Lutz Foucar, S. Düsterer
Rok vydání:	2008
Předmět:	Physics Photon Double ionization General Physics and Astronomy Electron Laser law.invention Ion Momentum Recoil law Ionization ddc:550 Physics::Atomic Physics Atomic physics
Zdroj:	Physical review letters 101, 073003 (2008). doi:10.1103/PhysRevLett.101.073003
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.101.073003
Popis:	Recoil-ion momentum distributions for two-photon double ionization of He and Ne (variant Planck's over omega=44 eV) have been recorded with a reaction microscope at FLASH (the free-electron laser at Hamburg) at an intensity of approximately 1 x 10(14) W/cm2 exploring the dynamics of the two fundamental two-photon-two-electron reaction pathways, namely, sequential and direct (or nonsequential) absorption of the photons. We find strong differences in the recoil-ion momentum patterns for the two mechanisms pointing to the significantly different two-electron emission dynamics and thus provide serious constraints for theoretical models.
Databáze:	OpenAIRE
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