Hamburg 2009 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 34: Poster II
A 34.51: Poster
Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster
Sequential Two-Photon Double Ionization of Ne — •Moritz Kurka1, Artem Rudenko2, Lutz Foucar3, Kai-Uwe Kühnel1, Yuhai Jiang1, Tilo Havermeier3, Sven Schössler3, Markus Schöffler3, Reinhard Dörner3, Michael Gensch4, Stefan Düsterer4, Wenbin Li4, Barbara Keitel4, Rolf Treusch4, Stephan Fritzsche5, A.N. Grum-Grzhimajlo6, Nikolay Kabachnik6,7, Claus Dieter Schröter1, Robert Moshammer1,2, and Joachim Ullrich1,2 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Max-Planck Advanced Study Group at CFEL, Hamburg — 3Institut für Kernphysik, Universität Frankfurt — 4DESY Hamburg — 5GSI Darmstadt — 6Institute of Nuclear Physics, Moscow State University — 7Fakultät für Physik, Universität Bielefeld
We present the results of a kinematically complete experiment on two-photon double ionization of Ne atoms with intense FLASH radiation at 44 eV photon energy. Employing the Reaction Microscope spectrometer, we were able to detect all three reaction products (a doubly charged ion and two emitted electrons) in coincidence, which ensures that no contributions from the competing processes (single ionization of Ne, ionization of the residual gas etc.) appear in the spectrum, and allows one us to distinguish the events corresponding to the different final states of the Ne2+ ion. Two-electron energy spectra undoubtedly confirm the sequential nature of the ionization process. We present electron angular distributions for the first and the second ionization step, as well as an angular correlation function, and compare them with recent theoretical predictions.