Oscillations of the CO oxidation on Rh induced by field-controlled Li coadsorption

The first observations of isothermal oscillating motion of the reaction/diffusion front during CO oxidation on a Rh field emitter tip are reported. Experiments were performed with a new lithium field desorption microscope (Li-FDM), using a special imaging mode which permits exclusive viewing of the...

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Bibliographic Details
Published in:Surface science 1995-12, Vol.343 (3), p.169-175
Main Authors: Medvedev, V.K., Suchorski, Yu, Block, J.H.
Format: Article
Language:English
Subjects:
Adsorption kinetics
Alkali metals
Applied sciences
Catalysis
Catalytic reactions
Chemistry
Exact sciences and technology
Field evaporation
Field ion microscopy
General and physical chemistry
Metals. Metallurgy
Oxidation
Rhodium
Solid-gas interface
Surface physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:The first observations of isothermal oscillating motion of the reaction/diffusion front during CO oxidation on a Rh field emitter tip are reported. Experiments were performed with a new lithium field desorption microscope (Li-FDM), using a special imaging mode which permits exclusive viewing of the reaction/diffusion front. The observed oscillations are generated by an artificial shift in the oxygen and CO adsorption/desorption kinetics caused by field-controlled selective Li coadsorption on a selected area of the Rh field emitter tip. In this way an example of the control of the adsorption properties of a surface on the atomic scale is demonstrated.
ISSN:0039-6028
1879-2758
DOI:10.1016/0039-6028(95)00694-X