Mainz 2017 – scientific programme

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MO: Fachverband Molekülphysik

MO 15: Environment Controlled Processes

MO 15.1: Invited Talk

Thursday, March 9, 2017, 14:30–15:00, N 6

Tracking electronic processes inside dense matter by luminescence — •André Knie — Universität Kassel, Institut für Physik und Center for Interdisciplinary Nanostructure Science and Technology (CINSaT)

Typically electronic processes are investigated by charged particle detection - very often by electron spectroscopy. The step from small ideal systems, e.g. atoms, molecules, or clusters, to dense (real life) systems is obstructed for those techniques due to the very short penetration depth (few nm) of the charged particles. Another approach is the detection of photons, with orders of magnitude larger mean free paths.

Here, it will be shown how we employ high-resolution luminescence spectroscopy to observe ultra-fast energy transfers, namely the interatomic Coulombic decay (ICD), in noble gas clusters and electronic processes of photo excited liquid water within a liquid microjet.

In noble gas clusters as prototypes for dense systems, the photon emission following the electronic process can be investigated from small to large clusters. The fingerprint of the ultra-fast ICD feature, which can be identified by excitation energy and decay times, shows dramatic trends upon transition from small (dilute) to large (dense) clusters. Another very dense sample with a major impact on our daily life is liquid water and the electronic processes occurring upon XUV irradiation. Due to their luminescence fingerprint, those processes and thereby liquid water itself could be tracked over vast distances, e.g. astronomical distances.