Mechanical Vibrations of Atomically Defined Metal Clusters: From Nano- to Molecular-Size Oscillators
- Paolo Maioli (1283781)
- Tatjana Stoll (1414399)
- Huziel E. Sauceda (5807729)
- Israel Valencia (2203120)
- Aude Demessence (2366521)
- Franck Bertorelle (1756252)
- Aurélien Crut (1283787)
- Fabrice Vallée (1283778)
- Ignacio L. Garzón (1451719)
- Giulio Cerullo (118912)
- Natalia Del Fatti (1283793)
DOIAbstract
Acoustic vibrations of small nanoparticles are still ruled by continuum mechanics laws down to diameters of a few nanometers. The elastic behavior at lower sizes (<1–2 nm), where nanoparticles become molecular clusters made by few tens to few atoms, is still little explored. The question remains to which extent the transition from small continuous-mass solids to discrete-atom molecular clusters affects their specific low-frequency vibrational modes, whose period is classically expected to linearly scale with diameter. Here, we investigate experimentally by ultrafast time-resolved optical spectroscopy the acoustic response of atomically defined ligand-protected metal clusters Aun(SR)m with a number n of atoms ranging from 10 to 102 (0.5–1.5 ...
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