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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Published in | Chemical physics letters Vol. 164; no. 2; pp. 126 - 130 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
08.12.1989
Elsevier Science |
Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 0009-2614 1873-4448 |
DOI: | 10.1016/0009-2614(89)85003-1 |