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Eur. Phys. J. Special Topics 169, 109-116 (2009)
DOI: 10.1140/epjst/e2009-00979-6
Single photon double ionization of
1 Institut für Kernphysik, University Frankfurt Max von Laue Str. 1, 60438 Frankfurt, Germany
2 DESY, Notkestrasse 85, 22607 Hamburg, Germany
3 Lawrence Berkeley National Lab., Berkeley, CA 94720, USA
4 Centro de Física de Materiales and Donostia International Physics Center, 20018 San Sebastián, Spain
5 State University of Aerospace Instrumentation, 190000 St. Petersburg, Russia
6 Dept. of Physics, Kansas State Univ, Cardwell Hall Manhattan, KS 66506, USA
7 Department of Physics, Auburn University Auburn, AL 36849, USA
doerner@atom.uni-frankfurt.de
© EDP Sciences, Springer-Verlag 2009
DOI: 10.1140/epjst/e2009-00979-6
Single photon double ionization of
by circularly polarized photons at a photon energy of 160 eV
Interference, decoherence and its dependence on the internuclear distance
K. Kreidi1, 2, D. Akoury1, T. Jahnke1, Th. Weber3, A. Staudte1, M. Schöffler3, N. Neumann1, J. Titze1, L.Ph.H. Schmidt1, A. Czasch1, O. Jagutzki1, R.A. Costa Fraga1, R.E. Grisenti1, R. Díez Muiño4, N.A. Cherepkov5, S.K. Semenov5, P. Ranitovic6, C.L. Cocke6, T. Osipov3, H. Adaniya3, J.C. Thompson7, M.H. Prior3, A. Belkacem3, A. Landers7, H. Schmidt-Böcking1 and R. Dörner11 Institut für Kernphysik, University Frankfurt Max von Laue Str. 1, 60438 Frankfurt, Germany
2 DESY, Notkestrasse 85, 22607 Hamburg, Germany
3 Lawrence Berkeley National Lab., Berkeley, CA 94720, USA
4 Centro de Física de Materiales and Donostia International Physics Center, 20018 San Sebastián, Spain
5 State University of Aerospace Instrumentation, 190000 St. Petersburg, Russia
6 Dept. of Physics, Kansas State Univ, Cardwell Hall Manhattan, KS 66506, USA
7 Department of Physics, Auburn University Auburn, AL 36849, USA
doerner@atom.uni-frankfurt.de
Abstract
We report on fully differential cross sections for double ionization of 
by a single circularly polarized photon of 160 eV energy. For an unequal sharing of the energy between the two electrons and a particular geometry where the influence of electron/electron interaction is constant, we find a four-lobe structure in the molecular frame angular distribution of the faster electron. This structure is interpreted to be due to a coherent emission of the electron from the two atomic centers of the molecule. This Young-type interference pattern is lost for other geometries, where electron-electron interaction plays a major role. Furthermore, we show that the interference structure depends strongly on the internuclear distance.
© EDP Sciences, Springer-Verlag 2009
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