Performances of the Lamb Model to Describe the Vibrations of Gold Quantum-Sized Clusters - Archive ouverte HAL Access content directly
Journal Articles Journal of Physical Chemistry C Year : 2020

Performances of the Lamb Model to Describe the Vibrations of Gold Quantum-Sized Clusters

Abstract

Lamb modes describe the vibrations of an object as a whole from the stellar scale to the nanometer one. Lamb description has been built from the linear elasticity theory and considers a homogeneous elastic sphere. Our work tries to determine the minimum scale where this description remains valid by studying the vibration of quantum-sized gold clusters (Au6, Au9, and Au25) stabilized by organic molecules. First, our work shows that experimental frequencies of small-functionalized gold clusters obtained by low-frequency Raman spectroscopy can be interpreted with density functional theory calculations. Moreover, the Lamb model broadly succeeds in predicting these Raman acoustic modes only if a correction considering the mass of the surrounding ligands is added. Ligands affect vibrational modes of the core by their mass but also by their covalent bond with the core. The unexpected consequence of this electronic stabilization by the ligands is the sustainability of the Lamb description for clusters as small as six atoms. Finally, the limit of the Lamb model can be reached out at low temperature where the vibration mode spectrum presents a substructuration that the Lamb description, developed for a homogeneous sphere, is unable to predict.
Fichier principal
Vignette du fichier
JPCC Martinet preprint.pdf (1.51 Mo) Télécharger le fichier
Origin Files produced by the author(s)
Loading...

Dates and versions

hal-02922362 , version 1 (26-08-2020)

Identifiers

Cite

Quentin Martinet, Alice Berthelot, Adrien Girard, Baira Donoeva, Clothilde Comby-Zerbino, et al.. Performances of the Lamb Model to Describe the Vibrations of Gold Quantum-Sized Clusters. Journal of Physical Chemistry C, 2020, 124 (35), pp.19324-19332. ⟨10.1021/acs.jpcc.0c04722⟩. ⟨hal-02922362⟩
196 View
241 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More