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Contenu archivé le 2024-05-07

Investigation of dynamic processes in adsorbed layers by photoemission electron microscopy - peem - and ellipsomicroscopy for surface imaging - emsi

Objectif



During heterogenous catalytic reactions, far from thermodynamic equilibrium, the reactants adsorbed on a surface, may exibit phenomena of intrinsic spatial and temporal self-organization. The Photo Emission Electron Microscope is capable of imaging the distribution of the adsorbed species in real time. Two new experimental methods, that will finally close the pressure gap between investigations under UHV conditions and the reality of catalysis, have been developed to investigate pattern formation during surface reactions. The Ellipso-Microscopy for Surface Imaging is sensitive even to submonolayer quantities of atoms adsorbed on a metal surface. Comparable sensitivity is achieved by the Reflection Anisotropy Microscopy which measures the variation of the normal-incidence reflectivity of linearly polarised light. The higher reaction rates at elevated pressures and under a small temperature gradient across the sample will lead to new phenomena in pattern formation and might also allow new insights to the fundamental processes.

Champ scientifique (EuroSciVoc)

Programme(s)

Thème(s)

Appel à propositions

Données non disponibles

Régime de financement

RGI - Research grants (individual fellowships)

Coordinateur

MAX-PLANCK-GESELLSCHAFT ZUR FOERDERUNG DER WISSENSCHAFTEN E.V.
Contribution de l’UE
Aucune donnée
Adresse
Faradayweg 4-6
14195 BERLIN
Allemagne
Coût total
Aucune donnée

Participants (1)