Structure of silver microclusters

Montano, Pedrog A.; Zhao, Jianmin; Ramanthan, Mohan; Shènoy, Gopal K.; Schulze, Wilfried; Urban, Joachim

doi:10.1016/0009-2614(89)85003-1

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Structure of silver microclusters

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Schulze, Wilfried
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Urban, Joachim
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Montano, P. A., Zhao, J., Ramanthan, M., Shènoy, G. K., Schulze, W., & Urban, J. (1989). Structure of silver microclusters. Chemical Physics Letters, 164(2-3), 126-130. doi:10.1016/0009-2614(89)85003-1.

Cite as: https://hdl.handle.net/21.11116/0000-0006-705D-4

Abstract

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.