By Roy Johnston, Roy L. Johnston
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Extra info for Atomic and Molecular Clusters, 1st Edition
Among other, more recent work, it is worth noting the studies by Märk and co-workers on and . Friedman and Buehler also found that the growth of large argon clusters (with an average N of approximately 560) was promoted by using a small concentration (2%) of Ar+ ions as seeds for cluster nucleation, with a large excess of He gas to cool the growing clusters. 2 shows the mass spectra of Ar, Kr and Xe clusters with up to 150 atoms. The figure shows that the intensities of the cluster peaks are not smoothly varying with cluster size.
2 (especially for Xe clusters) reveals local intensity maxima at the following magic number nuclearities: . Smaller features (secondary magic numbers) are observed at . Several of these magic numbers may be rationalized in terms of cluster structures consisting of concentric geometric (polyhedral) shells of atoms around a central atom. The best agreement with experiment is for structures composed of icosahedral shells, with multiple five-fold symmetry axes. Johnston This explains the peaks at , and .
4 Pulsed-Arc Cluster Ion Source (PACIS) PACIS sources are closely related to laser vaporization sources, but the cluster material is instead vaporized by an intense electrical discharge. 2 nm per pulse having been reported for the deposition of lead clusters. As many as 10% of the clusters generated by this source are charged. 7a. Clusters of refractory metals and other high-melting materials can be generated. This source typically generates small, singly ionized clusters, although mass selected beams of clusters with hundreds of atoms can be generated.
Atomic and Molecular Clusters, 1st Edition by Roy Johnston, Roy L. Johnston