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  Imaging of spatio-temporal pattern evolution during carbon monoxide oxidation on platinum

Rotermund, H.-H., Engel, W., Kordesch, M., & Ertl, G. (1990). Imaging of spatio-temporal pattern evolution during carbon monoxide oxidation on platinum. Nature, 343, 355-357. doi:/10.1038/343355a0.

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Rotermund, Harm-Hinrich1, Author           
Engel, Wilfried2, Author           
Kordesch, M.3, Author
Ertl, Gerhard1, Author           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Fritz Haber Institute, Max Planck Society, ou_24021              
3Department of Physics. University of Ohio, Athens, Ohio 45701-2979, USA , ou_persistent22              

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 Abstract: The rates of chemical reactions may exhibit temporal oscillations, even when the reaction parameters are kept constant. These oscillations might be associated with spatial pattern formation owing to local variations of concentrations or temperature, or both, which propagate as chemical waves1,2. An example is the catalytic oxidation of carbon monoxide on the surfaces of platinum single crystals. The mechanism of this reaction is well known, and under isothermal, low-pressure conditions, many types of temporal self-organization, ranging from harmonic oscillations to chaotic behaviour, have been observed3–6. Spatial patterns have also been demonstrated by scanning beams of either electrons3 or ultraviolet photons6 across the surface, and by monitoring the electrons reflected or photoemitted, respectively. However, both scanning techniques are hampered by limited temporal as well as lateral resolution. Here we present observations of an unexpectedly rich variety of self-sustained spatio-temporal patterns by continuous imaging (on a timescale of ≳1 ms) of the surfaces using a newly developed, photoemission electron microscope7 with a spatial resolution of a few micrometres. Pattern evolution can be followed on a much finer timescale than is available from other imaging techniques. We observe a new type of structure with strong similarities to those found in the Belousov–Zhabotinsky oscillatory reaction.

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Language(s): eng - English
 Dates: 1989-11-061989-12-121990-01-25
 Publication Status: Issued
 Pages: 3
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: /10.1038/343355a0
 Degree: -

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Title: Nature
  Abbreviation : Nature
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: 3 Volume / Issue: 343 Sequence Number: - Start / End Page: 355 - 357 Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238