Darmstadt 2008 – scientific programme
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MO: Fachverband Molekülphysik
MO 3: Femtosekundenspektroskopie I
MO 3.6: Talk
Monday, March 10, 2008, 15:30–15:45, 3G
Few photon induced dissociative ionization of N2 at FLASH — •Yuhai Jiang1, Lutz Foucar2, Artem Rudenko1, Moritz Kurka1, Claus Dieter Schröter1, Thorsten Ergler1, Kai Uwe Kühnel1, Markus Schöffler2, Sven Schössler2, Tilo Havermeier2, Mathias Smolarski2, Kyra Cole2, Thorsten Weber2, Reinhard Dörner2, Stefen Düsterer3, Rolf Treusch3, Paul Radcliffe3, Elke Plönjes3, Michael Gensch3, Robert Moshammer1, and Joachim Ullrich1 — 1Max-Planck-Institut fr Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — 2Institut für Kernphysik, Universität Frankfurt, D 60486 Frankfurt — 3DESY, Notkestrasse 85, 22607 Hamburg
The Free electron LASer at Hamburg (FLASH) delivers extreme ultraviolet (XUV) radiation at unprecedented intensities with femtosecond pulse durations. In combination with advanced multi-particle detection systems−the Heidelberg reaction microscope−this opens the door for mapping the dissociative multiple-ionization dynamics of molecules at ultrashort time scales. Multiple ionization of N2 and in particular the fragmentation channels N22+→ N++N+ and N23+→ N++N2+ induced by two and three XUV-photon of 44 eV, respectively, have been studied using our coincidence technique. On the basis of the kinetic energy releases of ionic fragments and the known molecular potential curves of dissociative states,it was found that sequential photoabsorption of N22+(d3Πg) → N23+ occurs at a time of about 20 fs after populating N22+ by absorption of two photons from the ground state of N2.