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Abstract
Photoabsorption spectra of neutral potassium clusters in helium nanodroplets are recorded by depletion spectroscopy using a supercontinuum laser source equipped with a variable bandpass filter. The results provide insight into the evolution of electronic spectra from molecular transitions to localized surface plasmon resonances in nanometer-sized clusters. Size selected spectra for potassium clusters Kn are acquired from n=2-110. Indications for the transition from molecularlike absorption to a collective resonance are already observed below n=20. For larger clusters, a splitting of the plasmon mode into two components is observed at around n=600. Supported by simulations, this is explained by the presence of nonspherical potassium nanoparticles grown via multicenter aggregation inside the helium droplets. The presented supercontinuum laser-based experimental approach provides a new route for the mass-selective spectroscopic characterization of different materials and material combinations isolated in helium nanodroplets in a size regime ranging from single atoms and molecules to small sub-10-nm particles.
Original language | English |
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Article number | 023148 |
Journal | Physical Review Research |
Volume | 4 |
Issue number | 2 |
DOIs | |
Publication status | Published - Jun 2022 |
ASJC Scopus subject areas
- Physics and Astronomy(all)
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Dive into the research topics of 'Photoabsorption of potassium clusters isolated in helium droplets: From discrete electronic transitions to collective resonances'. Together they form a unique fingerprint.Projects
- 1 Finished
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FWF - Plasmonic Nanoparticles - Plasmonic Nanoparticles in Helium Nanodroplets
16/04/18 → 15/07/22
Project: Research project