| Autor: |
Roman Messner, Robert di Vora, Wolfgang E. Ernst, Florian Lackner |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Physical Review Research, Vol 4, Iss 2, p 023148 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
2643-1564 |
| DOI: |
10.1103/PhysRevResearch.4.023148 |
| Popis: |
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 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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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