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Synchrotron radiation study of chloromethane clusters: Effects of polarizability and dipole moment on core level chemical shifts
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics V.
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2007 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 127, no 2, 024302- p.Article in journal (Refereed) Published
Abstract [en]

Free neutral chloromethane clusters have been produced by adiabatic expansion and investigated by means of photoelectron spectroscopy. By studying the differences between the cluster binding energy shifts at the Cl 2p and C 1s thresholds we have shown that antiparallel packing is the dominant local structure of the clusters. This geometry is induced by the polar character of the constituent molecules, and it accords with the structures of chloromethane solids and dimers. Furthermore, results obtained from the analysis of the outer valence levels of the clusters support the suggested local structure. The roles of the polarizability and of the dipole moment of the constituent molecules in the cluster binding energy shifts are discussed in comparison with a recent investigation of bromomethane clusters.

Place, publisher, year, edition, pages
2007. Vol. 127, no 2, 024302- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-97631DOI: 10.1063/1.2752164ISI: 000248020000011OAI: oai:DiVA.org:uu-97631DiVA: diva2:172651
Available from: 2008-10-23 Created: 2008-10-23 Last updated: 2016-04-26
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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Supervisors
Available from: 2008-10-23 Created: 2008-10-23 Last updated: 2010-03-11Bibliographically approved

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Björneholm, Olle

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