Abstract
Clusters are aggregates of a finite number of identical atoms or molecules, containing from a few to thousands of particles. They represent a form of matter intermediate between atoms and small molecules on one end and bulk solids and liquids on the other. Cluster research is motivated by the interest in mapping out the transition between the aforementioned limits, as well as by the fact that clusters possess a number of unique properties of their own [1]. In order to be able to monitor the atom-by-atom evolution of cluster properties, and to avoid their distortion by substrate effects, a large number of studies are performed on free clusters, making use of molecular beam techniques and mass spectrometry.
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Kresin, V.V., Scheidemann, A., Knight, W.D. (1994). Low-Energy Electron Collisions with Metal Clusters: Electron Capture and Cluster Fragmentation. In: Ehrhardt, H., Morgan, L.A. (eds) Electron Collisions with Molecules, Clusters, and Surfaces. Physics of Atoms and Molecules. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1489-7_15
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