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Scattering and Dissociation of Simple Molecules at Surfaces

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https://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2001022714
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DC ElementWertSprache
dc.contributor.advisorProf. Dr. W. Heiland
dc.creatorBrüning, Karsten
dc.date.accessioned2010-01-30T14:34:57Z
dc.date.available2010-01-30T14:34:57Z
dc.date.issued2001-02-27T08:50:43Z
dc.date.submitted2001-02-27T08:50:43Z
dc.identifier.urihttps://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2001022714-
dc.description.abstractThe dissociation of fast hydrogen and nitrogen molecular ions with kinetic energies ranging from 200 to 2000 eV/atom is studied for grazing collisions with various fcc metal surfaces. Within this energy range, the dissociation is either caused by electron capture into antibonding molecular states or by vibrational and rotational excitation. In contrast to hydrogen, nitrogen is chemically inert and interacts mainly elastically with the surfaces; thus there is no dissociation via electron capture. The processes of vibrational and rotational excitation are simulated using a molecular dynamics simulation with interaction potentials based on density functional theory. The comparison with the data obtained from Time-Of-Flight experiments reveals that an additional electronic effect has to be taken into account: The intramolecular bond of the molecules is softened due to electronic screening during the interaction with the surface. Hence, the softened molecules are more likely to dissociate through elastic collisions with surface atoms. The dissociation of hydrogen at low energies on metallic surfaces is dominated by electronic processes. An analysis of the kinetic energy distributions of the scattered dissociation products reveals information about the energy which is released during the dissociation process. The model of electronically induced dissociation is clearly confirmed by this method. However, an increasing contribution of additional mechanical processes becomes apparent at higher energies.eng
dc.language.isoeng
dc.subjectDissociation
dc.subjectScattering
dc.subjectIon-solid interactions
dc.subjectSurface channeling
dc.subjectDynamic screening
dc.subjectMolecular dynamics simulation
dc.subjectTOF
dc.subjectHydrogen
dc.subjectNitrogen
dc.subject.ddc530 - Physik
dc.titleScattering and Dissociation of Simple Molecules at Surfaceseng
dc.title.alternativeStreuung und Dissoziation einfacher Moleküle an Oberflächenger
dc.typeDissertation oder Habilitation [doctoralThesis]-
thesis.locationOsnabrück-
thesis.institutionUniversität-
thesis.typeDissertation [thesis.doctoral]-
thesis.date2001-01-29T12:00:00Z-
elib.elibid100-
elib.marc.edtfangmeier-
elib.dct.accessRightsa-
elib.dct.created2001-02-18T02:51:04Z-
elib.dct.modified2001-02-27T08:50:43Z-
dc.contributor.refereeapl. Prof. Dr. M. Neumann
dc.subject.dnb29 - Physik, Astronomieger
dc.subject.pacs34.50eng
dc.subject.pacs34.20eng
dc.subject.pacs79.20Reng
dc.subject.pacs33.15Feng
dc.subject.pacs68.35eng
dc.subject.pacs68.45eng
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