Scattering and reactivity of light molecules at metal surfaces

Informations projet

N° de convention de subvention: FMBI950377

Projet clôturé

Date de début 15 Janvier 1996

Date de fin 14 Janvier 1997

Financé au titre de

• Specific research and technological development programme in the field of the training and mobility of researchers, 1994-1998

Coût total Aucune donnée

Contribution de l’UE Aucune donnée

Coordonné par

Max-Planck-Gesellschaft zur Förderung der Wissenschaften eV
Germany

Objectif

This project is the continuation of a previous research program also financed by the EU. Our goal is the experimental characterization of the potential energy surface (PES) governing the interaction between simple molecules and surfaces.
Two different approaches are being pursued. In one set of experiments we want to investigate the diffraction of D2 molecules from surfaces presenting barriers of different heights to dissociative chemisorption. Very recent theories by Hollloway (1992) predict the onset of dramatic changes in the diffraction intensities when the incident energies are comparable with the dissociation barrier.
In a second set of experiments the hydrogen exchange reaction H2 + D2 = 2IID is being studied with of high resolution time-of-flight technique on highly reactive surfaces like Ni(110). The residence time of the reactants on the surface and other dynamical parameters can be directly measured by means of a newly conceived molecular beam techniz ue. We plan the study of this exchange reaction on the Ni(100) and the stepped Ni(115 surfaces as a function of the incident energy, incident angle and the surface azimut . Other surfaces with structural defects and clusters will be investigated. We are going to extend the range of incident beam energies up to 360 meV em- ploying recently developed high temperature nozzle source. The combined use of high crystal temperatures and highly energetic monochromatic molecular beams should allow the observation of the transition between slow, trapping-mediated (Langmuir-IIinshel- wood) and fastj direct (Eley-Rideal) chemical reaction mechanisms as recently proposed by Weinberg (1990)

Champ scientifique (EuroSciVoc)

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• sciences naturelles › sciences chimiques
• sciences agricoles › agriculture, sylviculture et pêche › sylviculture

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Programme(s)

• FP4-TMR - Specific research and technological development programme in the field of the training and mobility of researchers, 1994-1998

Thème(s)

• 0302 - Post-doctoral research training grants
• TP13 - Surface Physics

Appel à propositions

Data not available

Régime de financement

RGI - Research grants (individual fellowships)

Coordinateur

Max-Planck-Gesellschaft zur Förderung der Wissenschaften eV

• Contribution de l’UE: Aucune donnée
• Adresse: Bunsenstraße 10 ; 37073 Göttingen ; Allemagne
• Coût total: Aucune donnée

Participants (1)

Not available

Italie

• Contribution de l’UE: Aucune donnée
• Coût total: Aucune donnée