Journal of Chemical Physics
Feedback | Help | Exit
The Journal of Chemical Physics
Search:
   
 
 
 
Previous Article
Alkane dissociation dynamics on Pt(110)–(1×2)
Supersonic molecular beam techniques were used to study the reactive adsorption dynamics of methane and ethane on Pt(110)–(1×2). The initial dissociative sticking probability, S0, was meas...
Next Article
Picosecond measurement of substrate-to-adsorbate energy transfer: The frustrated translation of CO/Pt(111)
The transient infrared response of CO/Pt(111) following picosecond visible excitation is reported. A spectrally broad decrease in reflectivity correlates with heating of the Pt lattice, and an observe...

Reaction diffusion patterns in the catalytic CO-oxidation on Pt(110): Front propagation and spiral waves

J. Chem. Phys. 98, 9977 (1993); doi:10.1063/1.464323

Issue Date: 15 June 1993

You are not logged in to this journal. Log in

S. Nettesheim, A. von Oertzen, H. H. Rotermund, and G. Ertl
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, W-1000 Berlin 33, Germany
The dynamic behavior of elliptical front propagation and spiral-shaped excitation concentration waves associated with the catalytic oxidation of CO on a Pt(110)-surface was investigated by means of photoemission electron microscopy (PEEM). The properties of these patterns can be tuned through the control parameters, viz., the partial pressures of CO and O2 and the sample temperature. Over a wide range of control parameters the transition between two metastable states (COad and Oad covered surface) proceeds via nucleation and growth of elliptical reaction-diffusion (RD)-fronts. Front velocities and critical radii for nucleation are determined by the diffusion of adsorbed CO under reaction conditions. If at constant pO2, T the CO partial pressure is increased beyond a critical value a transition to qualitatively different dynamic behavior takes place. The elliptical fronts give way to oxygen spiral waves of excitation spreading across the CO-covered areas. For fixed experimental conditions a broad distribution of spatial wavelengths and temporal rotation periods was found. This effect has to be attributed to the existence of surface defects of µm-size to which the spiral tip is pinned. These data lead to a dispersion relation between the front propagation velocity and the wavelength, respectively, period. In addition, the dynamics of free spiral-shaped excitation waves was investigated under the influence of externally modulated temperature. Now the spiral starts to drift, resulting in distortion of the Archimedian shape and a pronounced Doppler effect. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
History: Received 29 December 1992; accepted 5 March 1993
Permalink: http://link.aip.org/link/?JCPSA6/98/9977/1
BUY THIS ARTICLE   (US$24)
Download PDF (1403 kB) View Cart

KEYWORDS and PACS

Keywords
PACS
  • 82.65.Jv
    Physical chemistry Surface and interface chemistry Heterogeneous catalysis at surfaces
  • 82.40.Ck
    Physical chemistry Chemical kinetics and reactions: special regimes and techniques Pattern formation in vorticesdiffusion systems
  • YEAR: 1993

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (33)
View in Separate Window/Tab
For access to fully linked references, you need to log in. For access to fully linked references, you need to Log in.
  1. S. Jakubith, H. H. Rotermund, W. Engel, A. von Oertzen, and G. Ertl, Phys. Rev. Lett. 65, 3013 (1990).
  2. H. H. Rotermund, S. Jakubith, A. von Oertzen, and G. Ertl, Phys. Rev. Lett. 66, 3083 (1991).
  3. G. Ertl, Science 254, 1750 (1991).
  4. T. Engel and G. Ertl, Adv. Catal. 28, 1 (1979).
  5. M. Bär, C. Zülicke, M. Eiswirth, and G. Ertl, J. Chem. Phys. 96, 8595 (1992).
  6. M. Eiswirth and G. Ertl, Surf. Sci. 122, 90 (1986).
  7. K. Krischer, M. Eiswirth, and G. Ertl, J. Chem. Phys. 96, 9161 (1992).
  8. W. Engel, M. E. Kordesch, H. H. Rotermund, S. Kubala, and A. von Oertzen, Ultramicrosc. 36, 148 (1991).
  9. A. von Oertzen, H. H. Rotermund, S. Jakubith, and G. Ertl, Ultramicrosc. 36, 107 (1991).
  10. H. H. Rotermund, S. Nettesheim, A. von Oertzen, and G. Ertl, Surf. Sci. 275, L645 (1992).
  11. C. Zülicke, A. S. Mikhailov, and L. Schimanski-Geier, Physica A 163, 559 (1990).
  12. R. Gomer, Rep. Prog. Phys. 53, 917 (1990).
  13. M. Bär, thesis FU Berlin, 1993 (in preparation).
  14. M. Eiswirth, P. Möller, K. Wetzl, R. Imbihl, and G. Ertl, J. Chem. Phys. 90, 510 (1989).
  15. W. Jahnke and A. T. Winfree, Int. J. Bifurc. Chaos 1, 445 (1991).
  16. T. Plesser, S. C. Müller, and B. Hess, J. Phys. Chem. 94, 7501 (1990).
  17. S. Ladas, R. Imbihl, and G. Ertl, Surf. Sci. 197, 153 (1988).
  18. R. Luther, Z. Elektrochem. 12, 596 (1906).
  19. K. Showalter and J. J. Tyson, J. Chem. Educ. 64, 742 (1987).
  20. A. von Oertzen, thesis FU Berlin, 1993 (in preparation).
  21. A. Nitzan, P. Ortoleva, and J. Ross, Faraday Symp. Chem. Soc. 9, 241 (1974).
  22. P. Foerster, S. C. Müller, and B. Hess, Science 241, 685 (1988).
  23. M. Falcke, M. Bär, H. Engel, and M. Eiswirth, J. Chem. Phys. 97, 4555 (1992).
  24. A. Pagola, J. Ross, and C. Vidal, J. Phys. Chem. 92, 163 (1988).
  25. J. J. Tyson and J. P. Keener, Physica D 32, 327 (1988).
  26. A. S. Mikhailov and V. S. Zykov, Physica D 52, 379 (1991).
  27. A. S. Mikhailov, Foundations of Synergetics I (Springer, Berlin, 1990).
  28. L. Kuhnert, Nature 319, 393 (1986).
  29. O. Steinbock, J. Schütze, and S. C. Müller, Phys. Rev. Lett. 68, 248 (1992).
  30. K. I. Agladze, V. A. Davydov, and A. S. Mikhailov, Sov. Phys. JETP Lett. 45, 601 (1987).
  31. M. Markus, Z. Nagy-Ungvarai, and B. Hess, Science 257, 225 (1992).
  32. M. Bär, M. Eiswirth, H. H. Rotermund, and G. Ertl, Phys. Rev. Lett. 69, 945 (1992).
  33. M. Ehsasi (personal communication).

CITING ARTICLES
For access to citing articles, you need to log in.
For access to citing articles, you need to Log in.


Copyright © American Institute of Physics