Darmstadt 2008 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 11: Posters: Interaction with attosecond and VUV-light
A 11.7: Poster
Dienstag, 11. März 2008, 16:30–18:30, Poster C3
Two-photon induced double ionization of atoms at FLASH — •Moritz Kurka1, Yuhai Jiang1, Lutz Foucar2, Artem Rudenko1, Claus Dieter Schröter1, Thorsten Ergler1, Daniel Fischer1, Jasmin Titzes2, Till Jahnke2, Markus Schöffler2, Thorsten Weber2, Reinhard Dörner2, Alexander Dorn1, Kai-Uwe Kühnel1, Stefen Düsterer3, Rolf Treusch3, Michael Gensch3, Sven Schössler2, Tilo Havermeier2, Mathias Smolarski2, Kyra Cole2, Robert Moshammer1, and Joachim Ullrich1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — 2Institut für Kernphysik, Universität Frankfurt, D 60486 Frankfurt — 3DESY, Notkestrasse 85, 22607 Hamburg
Two-photon double ionization (TP-DI) bridges the gap between single- and multi-photon double ionization regimes and, thus, is of decisive importance to advance non-linear quantum theories, particularly for non-sequential absorption of two photons. Recently, the most intense VUV laser source world-wide became operational, the free electron laser at Hamburg (FLASH). It enables for the first time systematic studies of two-photon induced atomic and molecular fragmentation processes. In this poster, we will present very recent experimental results of recoil ion momentum distributions for the TP-DI of He and Ne at photon energies of 45 and 38 eV, respectively, as well as fully differential measurements for TP-DI of Ne at a photon energy of 45 eV employing the Heidelberg reaction microscope. These results, which might serve as benchmark data for theories, will be discussed in terms of electron emission pattern and possible double ionization mechanisms.