Berlin 2014 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 10: Posters 2: Biomolecules, Energy Transfer, Clusters, Quantum Chemistry, Molecular Dynamics and Chirality
MO 10.6: Poster
Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais
Measurement of the Autoionization Lifetime of the Energetically Lowest Doubly-Excited Q1 1Σu+ State in H2 using Electron Ejection Asymmetry — •Andreas Fischer1, Alexander Sperl1, Philipp Cörlin1, Michael Schönwald1, Sebastian Meuren1, Joachim Ullrich2, Thomas Pfeifer1, Arne Senftleben1, and Robert Moshammer1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
Dissociative single ionization of H2 induced by broadband XUV photons has been studied in a kinematically complete experiment. Emphasis is put on the asymmetry in the electron emission direction with respect to the outgoing H+-ion [1] as function of the excess- energies. The results are well reproduced by semi-classical model calculations that take into account interference effects along different dissociation pathways [2].
We further present a way to use the measured asymmetry to disentangle the two contributing interfering pathways, direct ionization and autoionization. From this we are able to determine the autoionization lifetime of the energetically lowest doubly-excited Q1 1Σu+(1) state for a large range of internuclear distances [3].
Martín, F. et al. 2007 Science 315 5812
Fischer, A. et al. 2013 PRL 110 213002
Fischer, A. et al. 2013 J. Phys. B accepted