Journal
PHYSICAL REVIEW B
Volume 62, Issue 8, Pages 5179-5185Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.62.5179
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The optical properties of bimetallic silver-gold clusters are investigated in the size range 1.9-2.8 nm. Clusters, produced by laser vaporization of an alloy target Au-Ag (50%-50% atomic composition) are embedded with a low concentration in an alumina matrix. The mixed particles have the same stoichiometry as the rod. Absorption spectra exhibit a plasmon resonance band between those of pure Au and Ag embedded clusters, shifting towards higher energies with decreasing cluster size. Theoretical calculations in the frame of the time-dependent-local-density-approximation including an inner skin of ineffective screening and the porosity of the matrix, an in good agreement with experimental results.
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