Wasserstoff-Chemisorption an Metallclustern

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BURKART, Stefan, 2000. Wasserstoff-Chemisorption an Metallclustern [Dissertation]. Konstanz: University of Konstanz

@phdthesis{Burkart2000Wasse-9002, title={Wasserstoff-Chemisorption an Metallclustern}, year={2000}, author={Burkart, Stefan}, address={Konstanz}, school={Universität Konstanz} }

<rdf:RDF xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:void="http://rdfs.org/ns/void#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/9002"> <dc:language>deu</dc:language> <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/9002"/> <dc:format>application/pdf</dc:format> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:52:45Z</dc:date> <dcterms:abstract xml:lang="eng">The change of the electronic structure of small metal clusters upon hydrogen chemisorption is investigated by photoelectron spectroscopy of mass selected cluster anions. Generally the barrier for possible reactions between clusters may be correlated with the energy gap between the electronic ground state and the first excited state (HOMO-LUMO gap). Its quantity can be determined from photoelectron spectra. The properties of pure aluminum and gold clusters can be described by the jellium model. In this model the delocalized valence electrons are in the spherical potential of the cores. The bond of a hydrogen atom to an aluminum clusters may be characterized as covalent. For this system the jellium model is no longer an appropriate description. For the neutral Al_13H-cluster a large HOMO-LUMO gap of 1.5eV is found, indicating the extraordinarily high stability of this particle. Similar to the fullerenes it could be the building block of a new type of cluster material. The spectra of the Au_nH^- exhibit an unexpected similarity to those of the Au_n+1^- clusters. An additional H atom has almost the same effect on the photoelectron spectrum as an additional Au atom. It seems that the hydrogen atom behaves like a metal atom. Similar to aluminum clusters the bond may be characterized in fact as covalent, and there is no simple model to characterize this clusters. For small titanium clusters there is an experimental indication for a size-dependent change of the chemical nature of chemisorption. For clusters with up to four Ti atoms, adsorption of intact hydrogen molecules is the energetically preferred configuration. For clusters with five and more Ti atoms dissociative hydrogen chemisorption is the most stable configuration, forming clusters with an electronic structure similar to bulk TiH_2.</dcterms:abstract> <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/41"/> <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/rdf/resource/123456789/41"/> <foaf:homepage rdf:resource="http://localhost:8080/jspui"/> <dcterms:rights rdf:resource="https://kops.uni-konstanz.de/page/termsofuse"/> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:52:45Z</dcterms:available> <dcterms:issued>2000</dcterms:issued> <dc:contributor>Burkart, Stefan</dc:contributor> <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/9002/1/dr.pdf"/> <dcterms:title>Wasserstoff-Chemisorption an Metallclustern</dcterms:title> <dc:creator>Burkart, Stefan</dc:creator> <dc:rights>terms-of-use</dc:rights> <dcterms:alternative>Hydrogen chemisorption on metal clusters</dcterms:alternative> <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/> <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/9002/1/dr.pdf"/> </rdf:Description> </rdf:RDF>

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