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MO: Fachverband Molekülphysik

MO 29: Cluster and Nanoparticles II (joint session MO/A)

MO 29.5: Vortrag

Freitag, 14. März 2025, 12:15–12:30, HS XV

Droplet shape and quantum vortices visualized by the spectral shape of the electronic band origin of phthalocyanine doped into superfluid helium nanodroplets — •Rupert Jagode and Alkwin Slenczka — Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg

With the help of X-ray diffraction, the global shape of superfluid helium droplets could be imaged [1]. In addition, the inner structure, which may consist of quantum vortices - a specific form of angular momentum in quantum liquids - also became visible. These findings provide a consistent interpretation for the evolution of the spectral shape at the electronic band origin of phthalocyanine with increasing droplet size. Both the droplet shape and the presence of quantum vortices should have an effect on the solvent shift of the electronic transitions of the dopant molecule. New lineshape studies were carried out with systematic variation of the effective droplet sizes and optical anisotropy studies. From these new data, some of the still open questions regarding a reversal of the solvent shift [2] as well as the imperfect reproducibility of the observed signal splitting [2] could be clarified. Obviously, electronic spectroscopy complements the observations from X-ray diffraction on droplet shapes and the presence of quantum vortices for a range of smaller droplet sizes, which are relevant as host systems in molecular spectroscopy.

[1] B. Langbehn et al., Phys.Rev.Lett. 121, 255301 (2018), A. Ulmer et al., Phys.Rev.Lett. 131, 076022 (2023). [2] S. Fuchs et al., J.Chem.Phys. 148, 144301 (2018).

Keywords: superfluid helium droplets; line shape studies; droplet shape and vortices; electronic spectroscopy