Published in
American Physical Society, Physical Review Letters, 7(101)
DOI: 10.1103/physrevlett.101.073003
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Recoil-Ion Momentum Distributions for Two-Photon Double Ionization of He and Ne by 44 eV Free-Electron Laser Radiation
,
L. Foucar,
M. Kurka,
Th-H. Ergler,
K. U. Kühnel,
Y. H. Jiang,
A. Voitkiv,
B. Najjari,
A. Kheifets,
S. Lüdemann,
T. Havermeier,
M. Smolarski,
S. Schössler,
K. Cole,
M. Schöffler
and other authors.
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Abstract
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.