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The geometric structure of pure SF6 and mixed Ar/SF6 clusters investigated by core level photoelectron spectroscopy
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Surface and Interface Science.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Surface and Interface Science.
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2009 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 603, no 3, 433-436 p.Article in journal (Refereed) Published
Abstract [en]

The S 2p core level photoelectron spectra of Sulphurhexafluoride   Clusters have been investigated together with heterogeneous Ar/SF6 clusters, created by doping Ar host clusters (with a mean size of 3600   atoms) with the molecule. Surface and bulk features are resolved both   in the argon 2p and the sulphur 2p core level photoelectron spectra.  For the latter level such features were only observed in the pure   cluster case; a single feature characterizes the S 2p core level  spectra of SF6 doped argon clusters. From the chemical shifts,  investigated with respect to SF6 doping pressure. It can be concluded   that the host clusters get smaller with increasing doping pressures and  that the SF6 molecules predominantly stay below the cluster surface,   whereas the Argon core stays intact. We have neither observed features   corresponding to SF6 on the cluster Surface, nor features corresponding   to molecules deep inside the bulk in any of the spectra from the pick-up experiments.

Place, publisher, year, edition, pages
2009. Vol. 603, no 3, 433-436 p.
Keyword [en]
X-ray photoelectron spectroscopy, Argon, Sulphurhexaflouride, Heterogeneous, Homogeneous, Clusters
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-96751DOI: 10.1016/j.susc.2008.11.032ISI: 000263736400004OAI: oai:DiVA.org:uu-96751DiVA: diva2:171430
Available from: 2008-02-28 Created: 2008-02-28 Last updated: 2017-12-14Bibliographically approved
In thesis
1. A Treatise on the Geometric and Electronic Structure of Clusters: Investigated by Synchrotron Radiation Based Electron Spectroscopies
Open this publication in new window or tab >>A Treatise on the Geometric and Electronic Structure of Clusters: Investigated by Synchrotron Radiation Based Electron Spectroscopies
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Clusters are finite ensembles of atoms or molecules with sizes in the nanometer regime (i.e. nanoparticles). This thesis present results on the geometric and electronic structure of homogeneous and heterogeneous combinations of atoms and molecules. The systems have been studied with synchrotron radiation and valence, core and Auger electron spectroscopic techniques.

The first theme of the thesis is that of mixed clusters. It is shown that by varying the cluster production technique both structures that are close to that predicted by equilibrium considerations can be attained as well as far from equilibrium structures.

Electronic processes following ionization constitute the second theme. The post-collision interaction phenomenon, energy exchange between the photo- and the Auger electrons, is shown to be different in clusters of argon, krypton and xenon. A model is proposed that takes polarization screening in the final state into account. This result is of general character and should be applicable to the analysis of core level photoelectron and Auger electron spectra of insulating and semi-conducting bulk materials as well.

Interatomic Coloumbic Decay is a process that can occur in the condensed phases of weakly bonded systems. Results on the time-scale of the process in Ne clusters and mixed Ar/Ne clusters are herein discussed, as well observations of resonant contributions to the process. In analogy to Auger vis-à-vis Resonant Auger it is found that to the ICD process there is a corresponding Resonant ICD process possible. This has later been observed in other systems and by theoretical calculations as well in subsequent works by other groups.

Delocalization of dicationic valence final states in the hydrogen bonded ammonia clusters and aqueous ammonia has also been investigated by Auger electron spectroscopy. With those results it was possible to assign a previously observed feature in the Auger electron spectrum of solid ammonia.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2008. 103 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 393
Keyword
Cluster, nanoparticle, Heterogeneous, Homogeneous, Mixed, Cluster production methods, co-expansion, pick-up, doping, Cluster geometry, radial segregation, Interatomic Coulombic Decay, ICD, Auger electron spectroscopy, AES, X-ray photoelectron spectroscopy, XPS, Ultra-violet spectroscopy, UPS, Noble gas, Rare gas, Ne, Ar, Kr, Xe, Ammonia, NH3, Sulphur hexafluoride, SF6, MAX-lab, BESSY
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-8463 (URN)978-91-554-7095-1 (ISBN)
Public defence
2008-03-14, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15
Opponent
Supervisors
Available from: 2008-02-28 Created: 2008-02-28Bibliographically approved

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