Interference and electron entanglement in photoionization of H₂ and N₂

R. Dörner, D. Akoury, K. Kreidi, T. Jahnke, Th.Weber, A. Staudte, M. Sccöffler, N. Neumann, J. Titze, L. Ph. H. Schmidt, A. Czasch, O. Jagutzki, R.A. Costa Fraga, R.E. Grisenti , R. Diez Muino, N.A. Cherepkov, S.K. Semenov, P. Ranitovic, C.L. Cocke, T. Osipov, H. Adaniya, J.C. Thompson, M.H. Prior, A. Belkacem, A. Landers, H. Schmidt- Böcking

Institut für Kernphysik, University Frankfurt, Max von Laue Str 1, D-60438 Frankfurt Germany
Lawrence Berkeley National Lab., Berkeley CA 94720
Centro de Física de Materiales and Donostia International Physics Center, San Sebastian, Spain
State University of Aerospace Instrumentation, 190000 St. Petersburg, Russia
Dept of Physics, Kansas State Univ, Cardwell Hall, Manhattan KS 66506
Department of Physics, Auburn University, Auburn AL 36849

The talk will report on kinematically complete experiments on direct double ionization of H₂ and innershell ionization followed by Auger decay of N₂. Both electrons and both ions are measured in coincidence. For H₂ we show Thomas Young type double slit intereference and how it is lost by electron-electron correlations. This simple 4 body systems shows the first onset of the transition from the quantum to the classical world. [1,2]. For innershell ionization of N₂ we find a surprising solution for the 30 year old puzzle of core hole localization. We show that and how localization arises from quantum entanglement of the photo and Auger electron. Depending on photon energy and direction of the photoelectron the Auger angular distribution shows broken or restored symmetry which directly reflects the character of the innershell hole [3].

[1] Akoury et al. Science 318, 949 (2007)
[2] Kreidi et al. Phys.Rev.Lett. 100, 133005 (2008)
[3] Schöffler et al. Science, accepted

This work was supported by the Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy, and by the National Science Foundation.

Presented at X-Ray and Inner-Shell Processes (X08), June 2008, in Paris, France.

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