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SYET: Symposium Resonant Energy Transfer and Interatomic Coulombic Decay

SYET 1: Resonant Energy Transfer and Interatomic Coulombic Decay

SYET 1.4: Hauptvortrag

Donnerstag, 8. März 2018, 12:30–13:00, RW HS

The Experimental Investigation of Interatomic/Intermolecular Coulombic Decay — •Uwe Hergenhahn — Leibniz-Institut für Oberflächenmodifizierung, Leipzig — Max-Planck-Institut für Plasmaphysik, Greifswald

In this talk I will review the experimental investigation of Intermolecular Coulombic Decay (ICD). The notion that ICD involves an energy transfer between two sites, often depicted as the exchange of a virtual photon, implies that a description of the system using separate sites is meaningful, i.e. it is supposed to be weakly bonded. Intermolecular Coulombic Decay originally was predicted on theoretical grounds for hydrogen-bonded clusters [1], but first experiments were done on van-der-Waals bonded rare gas clusters. Meanwhile, it has been established that ICD and related processes are present in a wide range of systems and settings, and they have been studied by various experimental methods. Recent highlights include a view on ICD in the time domain, and the study of cascade processes consisting of Auger decay and non-local decay steps.

Often it is tacitly assumed that ICD takes place between neighbouring atoms or molecules. Recently, we presented studies in which a surprisingly large fraction of decays to the second coordination shell is seen. Finally, I will discuss results on the quantitative determination of the branching ratio for ICD vs. other relaxation channels, which highlight the importance of ultra-fast proton transfer in water aggregates (clusters and liquid water).

[1] L. S. Cederbaum et al., Phys. Rev. Lett. 79, 4778 (1997).