Core-hole screening as a probe for a metal-to-nonmetal transition in lead clusters

Metal clusters serve as model systems to study basic problems of electronic correlation. Vacuum ultraviolet light from the free-electron laser FLASH ionizes 5d electrons from mass-separated negatively charged clusters, thus transiently leading to core-ionized neutral systems. Shielding of the core h...

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Bibliographic Details
Published in:Physical review letters 2009-04, Vol.102 (13), p.138303-138303, Article 138303
Main Authors: Senz, V, Fischer, T, Oelssner, P, Tiggesbäumker, J, Stanzel, J, Bostedt, C, Thomas, H, Schöffler, M, Foucar, L, Martins, M, Neville, J, Neeb, M, Möller, Th, Wurth, W, Rühl, E, Dörner, R, Schmidt-Böcking, H, Eberhardt, W, Ganteför, G, Treusch, R, Radcliffe, P, Meiwes-Broer, K-H
Format: Article
Language:English
Subjects:
APPROXIMATIONS
BINDING ENERGY
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DROPLETS
ELECTRONS
FREE ELECTRON LASERS
SHIELDING
ULTRAVIOLET RADIATION
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Summary:Metal clusters serve as model systems to study basic problems of electronic correlation. Vacuum ultraviolet light from the free-electron laser FLASH ionizes 5d electrons from mass-separated negatively charged clusters, thus transiently leading to core-ionized neutral systems. Shielding of the core hole affects the electron binding energy. From the strong deviation from expectations of the metallic droplet and jellium models we conclude on reduced electronic shielding once the cluster size falls below about 20 atoms. This suggests a metal-to-nonmetal transition, in agreement with previous local density approximation calculations.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.102.138303