Unusual behaviour of chemical waves in the NO + H2 reaction on Rh(111)
Long-range diffusion and formation of patches with reduced work function
- authored by
- N. M.H. Janssen, A. Schaak, B. E. Nieuwenhuys, R. Imbihl
- Abstract
Pattern formation in the NO+ H2 reaction on Rh(111) has been investigated in the 10-6 mbar range using photoelectron emission microscopy (PEEM) as a spatially resolving method. Target patterns, spiral waves and irregular patterns are observed in a T-window of ∼ 20 K width at around 460 K, located in the transition range between the reactive and unreactive states of the surface. A new species characterized by a work function below that of the clean surface forms upon collision of two wave fronts. This new species is tentatively assigned to subsurface oxygen. The colliding wave fronts start to interact when they are still more than 100 μm apart, thus demonstrating the presence of a long-range diffusional coupling.
- Organisation(s)
-
Institute of Physical Chemistry and Electrochemistry
- External Organisation(s)
-
Leiden University
- Type
- Article
- Journal
- Surface science
- Volume
- 364
- Pages
- L555-L562
- ISSN
- 0039-6028
- Publication date
- 20.08.1996
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Condensed Matter Physics, Surfaces and Interfaces, Surfaces, Coatings and Films, Materials Chemistry
- Electronic version(s)
-
https://doi.org/10.1016/0039-6028(96)00793-5 (Access:
Closed)
