Structure of silver microclusters

We have studied the structure of Ag microclusters using EXAFS. The measurements were performed over a wide range of cluster sizes at the National Synchrotron Light Source (NSLS), beam line X-18B. The clusters were prepared using the gas aggregation technique and isolated in solid argon at 4.2 K. A s...

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Bibliographic Details
Published inChemical physics letters Vol. 164; no. 2; pp. 126 - 130
Main Authors Montano, P.A., Zhao, J., Ramanathan, M., Shenoy, G.K., Schulze, W., Urban, J.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 08.12.1989
Elsevier Science
Subjects
Atomic and molecular clusters
Atomic and molecular physics
Exact sciences and technology
Physics
Studies of special atoms, molecules and their ions; clusters
Matrix isolation
Metal cluster
Size
Atomic cluster
Geometrical configuration
Experimental study
Silver Molecules
EXAFS spectrometry
Inorganic compound
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Summary:We have studied the structure of Ag microclusters using EXAFS. The measurements were performed over a wide range of cluster sizes at the National Synchrotron Light Source (NSLS), beam line X-18B. The clusters were prepared using the gas aggregation technique and isolated in solid argon at 4.2 K. A strong contraction of the interatomic distances was observed for Ag dimers and multimers. Clusters larger than a mean diameter of 20 Å show a small contraction of the nearest-neighbor distance and a structure consistent with an fcc lattice. By contrast, microclusters between 9 and 16 Å show a small nearest-neighbor expansion and a strong reduction or absence of higher-order shells in the EXAFS spectra. This suggests a different crystallographic structure for these Ag microclusters.
ISSN:0009-2614
1873-4448
DOI:10.1016/0009-2614(89)85003-1