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MO: Fachverband Molekülphysik

MO 3: Electronic I

MO 3.5: Vortrag

Montag, 14. März 2022, 17:45–18:00, MO-H5

Spectroscopy of Potassium Clusters Isolated in Helium Nanodroplets — Roman Messner, Robert di Vora, Wolfgang E. Ernst, and •Florian Lackner — Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria

We explore the evolution of the electronic spectrum of potassium clusters isolated in helium droplets from single atoms and molecules up to nanometer sized clusters. A supercontinuum laser equipped with a tunable filter is used to excite the potassium clusters. In combination with a time-of-flight mass spectrometer atomically precise spectra up to K₁₁₀ are recorded. Spectra for larger clusters within a selected size range are also recorded, revealing insight into the properties and growth of potassium nanoparticles in helium droplets. While small molecules exhibit multiple distinct spectral features, a collective resonance emerges at about 600 nm in the spectra of larger clusters. With increasing cluster size, this resonance continuously shifts towards the blue.