Bonn 2025 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 28: Ultrafast Dynamics IV
MO 28.7: Vortrag
Freitag, 14. März 2025, 12:30–12:45, HS XVI
Anomalous diffusion of free-base phthalocyanine on rare-gas clusters — •Arne Morlok, Ulrich Bangert, Philipp Elsässer, Yilin Li, Felix Riedel, Tanja Schilling, Lukas Bruder, and Frank Stienkemeier — University of Freiburg, Institute of Physics, Hermann-Herder-Straße 3, 79104 Freiburg, Germany
Precise knowledge and control of the environment are essential in diffusion studies, as interactions between a diffusing particle and its surroundings can lead to anomalous diffusion, deviating from simple Brownian motion. To address this, we employ cluster-isolation spectroscopy, which provides well-studied and weakly interacting rare-gas clusters as the environment. Experiments are conducted with solid rare-gas clusters of argon and neon doped with free-base phthalocyanine (H2Pc) and interrogated with action-based two-dimensional electronic spectroscopy. The high spectro-temporal resolution of this technique allows us to resolve subtle changes in binding configurations with femtosecond precision. We report an anomalous diffusion behavior of H2Pc in both of the dopant-host nanosystems on a picosecond timescale. Molecular dynamics simulations confirm these findings and further reveal that movement of H2Pc is confined to rotations on a single facet of the icosahedral host cluster.
Keywords: Phthalocyanine; Diffusion; 2D Spectroscopy; cluster-isolation spectroscopy