Dynamics of the activated dissociative chemisorption of N2 on W(110): A molecular beam study

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dc.identifier.uri http://dx.doi.org/10.15488/2770
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/2796
dc.contributor.author Pfnür, Herbert
dc.contributor.author Rettner, C.T.
dc.contributor.author Lee, J.
dc.contributor.author Madix, R.J.
dc.contributor.author Auerbach, D.J.
dc.date.accessioned 2018-02-19T14:09:37Z
dc.date.available 2018-02-19T14:09:37Z
dc.date.issued 1986
dc.identifier.citation Pfnür, H.; Rettner, C.T.; Lee, J.; Madix, R.J.; Auerbach, D.J.: Dynamics of the activated dissociative chemisorption of N2 on W(110): A molecular beam study. In: Journal of Chemical Physics 85 (1986), 7452. DOI: https://doi.org/10.1063/1.451334
dc.description.abstract Molecular beam techniques have been used to study the dissociative chemisorption of nitrogen on W(110). Chemisorption probabilities have been measured as a function of incidence angle θi and kinetic energy Ei surface coverage and temperature. In addition, angular scattering distributions have been measured for a range of conditions and LEED has been used to examine surface structure. The initial (zero coverage limit) sticking probability is found to depend strongly on the incidence energy, scaling approximately with Ei, rather than with the velocity component normal to the surface. This probability is ≤3×10−3 for Ei≤30 kJ mol−1, and rises by more than a factor of 100 by ∼100 kJ mol−1, where it levels off at ∼0.35. It is argued that this behavior arises due to a strong chemical interaction prior to the barrier to dissociation. Angular scattering distributions revealed predominately quasispecular scattering with evidence as well for a diffuse component at low energies. The sticking probability falls steadily with increasing surface coverage and a saturation coverage of ∼0.25 atomic ML is observed for Ei∼10 kJ mol−1. At higher incidence kinetic energies, this saturation coverage increases to ∼0.5 ML at 200 kJ mol−1. LEED structures are also reported, corresponding to coverages of 0.25, 0.3, 0.5, and 0.52 ML. The 0.25 and 0.5 ML structures are identified as p(2×2) and c(4×2), respectively, for which structure models are proposed. eng
dc.language.iso eng
dc.publisher College Park, MD : American Institute of Physics
dc.relation.ispartofseries Journal of Chemical Physics 85 (1986)
dc.rights Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
dc.subject chemisorption eng
dc.subject angular distribution eng
dc.subject nitrogen eng
dc.subject.ddc 530 | Physik ger
dc.title Dynamics of the activated dissociative chemisorption of N2 on W(110): A molecular beam study
dc.type article
dc.type Text
dc.relation.issn 00219606
dc.relation.doi https://doi.org/10.1063/1.451334
dc.bibliographicCitation.volume 85
dc.bibliographicCitation.firstPage 7452
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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