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Direct observation of the non-supported metal nanoparticle electron density of states by X-ray photoelectron spectroscopy
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
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2007 (English)In: European Physical Journal D: Atomic, Molecular and Optical Physics, ISSN 1434-6060, E-ISSN 1434-6079, Vol. 45, no 2, 295-299 p.Article in journal (Refereed) Published
Abstract [en]

Synchrotron-based X-ray photoelectron spectroscopy on copper and silver cluster beams created by a magnetron-based gas-aggregation source has allowed mapping the electron density of states (DOS) of free metallic nanoparticles. The cluster DOS profiles obtained in the experiments strongly resemble the infinite solid DOS shapes, but the extracted cluster work-functions are lower than those for the bulk metal. The latter observation is explained by the initial negative charge on most of the clusters, created by the source.

Place, publisher, year, edition, pages
2007. Vol. 45, no 2, 295-299 p.
Keyword [en]
73.22.-f Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals - 79.60.-i Photoemission and photoelectron spectra
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-97639DOI: 10.1140/epjd/e2007-00252-0ISI: 000250136000014OAI: oai:DiVA.org:uu-97639DiVA: diva2:172659
Available from: 2008-10-23 Created: 2008-10-23 Last updated: 2017-01-25
In thesis
1. Free Molecular and Metal Clusters Studied by Synchrotron Radiation Based Electron Spectroscopy
Open this publication in new window or tab >>Free Molecular and Metal Clusters Studied by Synchrotron Radiation Based Electron Spectroscopy
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The main purpose of this Thesis is the experimental characterization of the electronic and geometric structures of objects called clusters. A cluster consists of a finite group of bound atoms or molecules. Due to its finite size, it may present completely different properties than those of the isolated atom and the bulk. The clusters studied in this work are constituted by rare-gas atoms, organic molecules, and metal atoms. Intense cluster beams were created using either an adiabatic expansion source or a gas-aggregation source, and investigated by means of synchrotron radiation based photoelectron spectroscopy.

The reports presented in this Thesis may be divided into three parts. The first one deals with results concerning homogeneous molecular clusters (benzene- and methyl-related clusters) highlighting how molecular properties, such as dipole moment and polarizability, influence the cluster structure. The second part focuses on studies of solvation processes in clusters. In particular, the adsorption of polar molecules on rare-gas clusters is studied. It is shown that the doping method, i.e. the technique used to expose clusters to molecules, and the fraction of polar molecules are important factors in determining the location of the molecules in the clusters. Finally, a summary of investigations performed on metal clusters is presented. The applicability of solid state models to analyse the cluster spectra is considered, and the differences between the atomic, cluster and solid electronic structures are discussed.

Place, publisher, year, edition, pages
Uppsala: Universitetsbiblioteket, 2008. 66 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 561
Keyword
nanoparticles, free clusters, molecular clusters, metal clusters, photoelectron spectroscopy, synchrotron radiation, local structure, core level spectroscopy, auger spectroscopy, heterogeneous clusters, nucleation, bromomethane, chloromethane, benzene, bromobenzene, chlorobenzene, potassium, sodium, simple metals
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-9323 (URN)978-91-554-7307-5 (ISBN)
Public defence
2008-11-13, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
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Available from: 2008-10-23 Created: 2008-10-23 Last updated: 2010-03-11Bibliographically approved

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Öhrwall, GunnarRander, TorbjörnLindblad, AndreasBergersen, HenrikPokapanich, WandaredSvensson, SvanteBjörneholm, Olle

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European Physical Journal D: Atomic, Molecular and Optical Physics
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