Hannover 2003 – wissenschaftliches Programm
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A: Atomphysik
A 17: Postersitzung 2
A 17.36: Poster
Donnerstag, 27. März 2003, 16:00–18:30, Poster
Energy sharing and asymmetry parameters for photo double ionization of Helium 100 eV above threshold in single particle and Jacobi coordinates — •Alexandra Knapp1, M. Walter2, Th. Weber1, A.L. Landers3, S. Schössler1, T. Jahnke1, M. Schöffler1, J. Nickles1, S. Kammer1, O. Jagutzki1, L.Ph.H. Schmidt1, T. Osipov4, J. Rösch1,5, M.H. Prior5, H. Schmidt-Böcking1, C.L. Cocke4, J. Feagin6, and R. Dörner1 — 1Institut für Kernphysik, Universität Frankfurt am Main, August-Euler-Strasse 6, D-60486 Frankfurt — 2Fakultät für Physik, Universtät Freiburg — 3Department of Physics, Western Michigan Univ., Kalamazoo, MI 49008 — 4Dept. of Physics, Kansas State Univ, Cardwell Hall, Manhattan KS 66506 — 5Lawrence Berkeley National Lab., Berkeley CA 94720 — 6Department of Physics, California State University-Fullerton, Fullerton, California 92834
We present a joint experimental and theoretical study of the double differential cross section of the double ionization of helium by absorption of one 179 eV linearly polarized photon (100 eV above threshold). We show the energy sharing and the asymmetry parameters in both single particle coordinates and in Jacobi coordinates. An asymmetric sharing of the electron excess energy and a breakup of the electron pair preferentially parallel to the polarization axis is found. This marks a deviation from the propensity rule favoring perpendicular relative electron motion which has been observed to hold at energies closer to the double ionization threshold.