Clusters on surfaces: high-resolution spectroscopy at low temperatures

With controlled growth in nanometer-sized pits we produced silver and gold clusters on a graphite surface. We give a summary of the preparation method and discuss the scanning tunneling imaging and the crystalline orientation of the clusters. The electronic structure of the clusters was studied by a...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2001-03, Vol.72 (3), p.295-302
Main Author: Hovel, H
Format: Article
Language:English
Subjects:
Clusters
Electronic structure
Imaging
Materials science
Pits
Scanning tunneling microscopy
Silver
UPS
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Summary:With controlled growth in nanometer-sized pits we produced silver and gold clusters on a graphite surface. We give a summary of the preparation method and discuss the scanning tunneling imaging and the crystalline orientation of the clusters. The electronic structure of the clusters was studied by an in-situ combination of ultraviolet photoelectron spectroscopy (UPS) and scanning tunneling spectroscopy (STS). For both techniques we obtained an energy resolution in the range of 10 meV employing low sample temperatures. Dynamic final-state effects together with averaging over a cluster-size distribution result in characteristic spectral shapes in UPS, which can be understood referring to STS data taken on individual clusters. Finally, directions for future experiments are pointed out.
ISSN:0947-8396
1432-0630
DOI:10.1007/s003390100768