Mainz 2017 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 12: Posters 2: Molecular Dynamics, Clusters, and High Resolution Spectroscopy
MO 12.7: Poster
Mittwoch, 8. März 2017, 17:00–19:00, P OG1
Exploring Non-local Autoionization in Water Clusters and Aqueous Solutions — •Clemens Richter1, Marvin N. Pohl2, Clara Saak4, Melanie Mucke4, Evgeny Lugovoy1, Robert Seidel2, Emad F. Aziz2, Bernd Abel1, Bernd Winter2, and Uwe Hergenhahn1,3 — 1Leibniz Institute of Surface Modification, Leibzig, Germany — 2Helmholtz-Zentrum Berlin, Berlin, Germany — 3Max-Planck-Institut für Plasmaphysik, Greifswald, Germany — 4Uppsala University, Uppsala, Sweden
Interaction of matter with ionizing radiation leads to emission of a multitude of electrons, either by direct photoemission or via secondary pathways, i.e. local and non-local autoionization. While the local Auger process is well established, the non-local processes intermolecular coulombic decay (ICD) and electron transfer mediated decay (ETMD) are topics of current research. Since both processes lead to the emission of low energy electrons - a primary source of radiation damage - we investigate autoionization in water and aqueous solutions of biological relevance. In our experiments electron-electron coincidence spectroscopy is performed using a magnetic bottle electron spectrometer. We present two examples of our current research on water-uracil clusters applying our newly constructed source for solvated biomolecule clusters as well as our first coincidence measurements of Li salt solutions using a liquid jet. While in the water-uracil clusters ICD is the predominant autoionization process. The Li salt solutions unambiguously display an ETMD signature. Moreover, we discuss ETMD spectroscopy as potential tool for measuring contact ion pairs in solution.