Seminars Archive

Nanoscale Fermi Systems: Structure and dynamics of metal clusters

Abstract
Clusters are fascinating objects: on one hand they allow to follow the development of bulk properties when building up matter atom by atom; on the other hand they represent ideal model systems for the study of a large variety of many particle effects. Due to a number of technical improvements free size selected clusters with defined temperatures can now be studied in a very broad size range with several high resolution spectroscopy techniques. A couple of experiments will be presented, ranging from photofragmentation and photoelectron spectroscopy on free metal clusters to STM studies of softlanded clusters. The results demonstrate the influence of finite size effects on the electronic and geometric structure of the clusters as well as on general properties like electron-phonon coupling or the free electron mass. Special emphasis will be put on very recent measurements of angle resolved photoelectron spectra on free size selected low temperature sodium clusters, which constitue a sensitive test for the coherence of electron emission out of these many electron systems.