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- W4299894439 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 ${mathrm{K}}_{n}$ 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." @default.
- W4299894439 created "2022-10-03" @default.
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- W4299894439 date "2022-05-24" @default.
- W4299894439 modified "2023-10-16" @default.
- W4299894439 title "Photoabsorption of potassium clusters isolated in helium droplets: From discrete electronic transitions to collective resonances" @default.
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- W4299894439 doi "https://doi.org/10.1103/physrevresearch.4.023148" @default.
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