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MO: Fachverband Molekülphysik

MO 7: Clusters II (joint session MO/A)

MO 7.2: Vortrag

Dienstag, 10. März 2020, 14:15–14:30, f142

Competition between inter- and intra-atomic ionization phenomena: Observation of Electron-Transfer-Mediated decay and Auger decay in Xenon-doped water clusters — •Aaron Ngai¹, Rupert Michiels¹, Nora Berrah², Carlo Callegari³, Edwin Chapman¹, Raimund Feifel⁴, Michele Di Fraia³, Jakob Krull¹, Aaron C. LaForge², Paolo Piseri⁵, Oksana Plekan³, Kevin Prince³, Richard J. Squibb⁴, Vit Svoboda⁶, Daniel Uhl¹, Hans-Jakob Wörner⁶, Andreas Wituschek¹, and Frank Stienkemeier¹ — ¹Insititute of Physics, University of Freiburg — ²Department of Physics, University of Connecticut — ³Elettra-Sincrotrone Trieste — ⁴Department of Physics, University of Gothenburg — ⁵Dipartimento di Fisica and CIMaINa — ⁶Laboratorium für Physikaliche Chemie, ETH Zürich

Electron-transfer-mediated decay (ETMD) is a subset of the more general inter-coulombic decay (ICD). In condensed-matter or cluster systems, ETMD competes with other ionization processes such as autoionization (e.g. Auger decay). Using XUV-XUV pump-probe spectroscopy, we observe the competition between ETMD and Auger decay of Xe⁺ (4d_3/2 and 4d_5/2) embedded in water clusters. In particular, we can distinguish between these two similar processes by observing the resulting Xe^N+ ions in addition to time-resolving their femtosecond dynamics. In our experiment using the FERMI FEL at Elettra, two main features differentiating these decays are expected: the charges of the final Xe^N+ ions, and kinetic energy broadening of Auger electrons through post-collision interactions (PCI).