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A: Fachverband Atomphysik
A 35: Cluster and Nanoparticles (joint session MO/A)
A 35.2: Vortrag
Donnerstag, 5. März 2026, 15:45–16:00, P 105
Size characterization of doped rare-gas clusters utilizing rotational coherence spectroscopy — •Arne Morlok1, Grzegorz Kowzan2, Ulrich Bangert1, Yilin Li1, Frank Stienkemeier1, and Lukas Bruder1 — 1University of Freiburg, Institute of Physics, Hermann-Herder-Straße 3, 79104 Freiburg, Germany — 2Nicolaus Copernicus University in Torun, Institute of Physics, Grudziadzka 5, 87-100 Torun, Poland
A prominent challenge in spectroscopy is to investigate individual molecules or their aggregates in a well-defined and controlled environment. This goal can be accomplished with cluster-isolation spectroscopy, a technique in which molecules are isolated in or on the surface of rare-gas clusters. A complication of this technique is that the clusters, which are produced in a supersonic expansion, do not have a uniform size but follow a broad size distribution dependent on the expansion conditions. Although semi-empirical scaling laws based on the expansion parameters have been derived in order to predict the mean cluster size, results seem to underestimate the actual cluster size in comparison with experimentally determined size distributions. In this contribution, a novel spectroscopic approach is discussed to determine the mean cluster size of neutral rare-gas clusters. The technique is based on already known methods from rotational coherence spectroscopy. Results suggest a new scaling regime for the mean cluster size in the already established model in a certain parameter range.
Keywords: Rotational coherence spectroscopy; Rare-gas clusters; Hagena; Cluster isolation; Time-resolved spectroscopy