Inelastic Light Scattering from Metal Clusters: Some Recent Developments
Most Raman and resonance Raman experiments on small metal aggregates have been performed with the scattering particles isolated in rare gas matrices. The matrices permit a high cluster density, but they also influence their spectroscopic properties. Cluster-support interactions become important and may cause a multiplication of vibrational modes, e.g., due to trapping site effects or isomerization processes. The least perturbed vibrational mode usually will be the totally symmetric one. External modes of the particle may appear which directly probe the interaction of the cluster with the matrix support at the particular trapping site. For silver dimers these were used to identify the geometries of various trapping sites by means of a computer simulation.
Clusters deposited on solid surfaces have been little studied by light scattering techniques, despite their importance in catalysis and surface enhanced Raman scattering. Germanium clusters have been probed by Raman scattering. Elastic forces between gold clusters on NaCl have been studied by surface Brillouin scattering.
A few light scattering experiments have been performed with van der Waals and molecular clusters in free jet expansions.
KeywordsSurface Enhance Raman Scattering Gold Cluster Trapping Site Resonance Raman Spectrum Light Scattering Experiment
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