NDLI: Abstracts of the invited contributions by alphabetic order : Photoinduced processes at nanoparticulate systems

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Abstracts of the invited contributions by alphabetic order : Photoinduced processes at nanoparticulate systems

Content Provider	Semantic Scholar
Author	Hess, Ch. P. Wolf, Michael Ertl, Gerhard
Abstract	s of the invited contributions by alphabetic order: Photoinduced processes at nanoparticulate systems Katharina Al−Shamery Carl v. Ossietzky Universität Oldenburg, Physikalische Chemie, Postfach 2503, 26111 Oldenburg, Germany Nano−sized transition metal clusters exhibit unique strongly size dependent properties with respect to their electronic structure as well as morphology. This can be further influenced by the interaction with the solid support. It will be shown that control over the branching ratio of reaction channels of photoinduced processes at nanoparticulate systems can be obtained by tuning the particle size. Experiments will be presented about the UV−laser induced photochemistry of methane, NO and CO adsorbed on Pd aggregates deposited on an epitaxial film of Al2O3 on NiAl(110) at 3.5 eV and 6.4 eV. Aggregate diameters range between 5 Å up to more than 80 Å. Within this size regime properties change from more molecular to metallic behaviour which is furthermore depending on the adsorbate coverage. Aggregates of intermediate size have diameters in the size regime of the mean free path of the electrons. The strong cluster size dependence of the ratio of photodesorption to photodissociation of methane will be discussed. Photodesorption of NO is more complex and depends on the adsorption species which differ from bulk adsorption species. CO does not desorb even from small aggregates. However, interesting adsorption state changes are observed after laser excitation inverse to thermally induced processes. This behaviour is only observed in a certain coverage regime and is related to the occurrence of solitons. Probing Electron Dynamics with STM
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Alternate Webpage(s)	http://dipc.ehu.es/dipc/WorkshopAngel/curso_abs.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Synopsis

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