Details
| Original language | English |
|---|---|
| Pages (from-to) | 33-44 |
| Number of pages | 12 |
| Journal | Surface science |
| Volume | 441 |
| Issue number | 1 |
| Publication status | Published - 20 Oct 1999 |
Abstract
The adsorption of oxygen and chemical wave patterns in the O2+H2 and NO+H2 reactions have been studied at p<10-4mbar on an Rh(533) surface. Low energy electron diffraction, Auger electron spectroscopy, thermal desorption spectroscopy and work function measurements with a Kelvin probe served to characterize the integral adsorption behavior, whereas photoemission electron microscopy was used as the spatially resolving method. Oxygen adsorbs on Rh(533) with an initial sticking coefficient of 0.8 at 340 K. Reaction fronts elliptically deformed in the direction parallel to the step edges were found in the bistable O2+H2 reaction. Similarly, also in the excitable NO+H2 reaction elliptically deformed target patterns and spiral waves were observed in the temperature range from 430 to 490 K. For both reactions the dependence of the front/pulse velocity on temperature and pH(2) was investigated in the direction parallel and perpendicular to the step edges.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Materials Science(all)
- Surfaces, Coatings and Films
- Materials Science(all)
- Materials Chemistry
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In: Surface science, Vol. 441, No. 1, 20.10.1999, p. 33-44.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Anisotropic chemical waves on a stepped surface
T2 - The NO+H2 and O2+H2 reactions on Rh(533)
AU - Schaak, A.
AU - Nieuwenhuys, B.
AU - Imbihl, R.
PY - 1999/10/20
Y1 - 1999/10/20
N2 - The adsorption of oxygen and chemical wave patterns in the O2+H2 and NO+H2 reactions have been studied at p<10-4mbar on an Rh(533) surface. Low energy electron diffraction, Auger electron spectroscopy, thermal desorption spectroscopy and work function measurements with a Kelvin probe served to characterize the integral adsorption behavior, whereas photoemission electron microscopy was used as the spatially resolving method. Oxygen adsorbs on Rh(533) with an initial sticking coefficient of 0.8 at 340 K. Reaction fronts elliptically deformed in the direction parallel to the step edges were found in the bistable O2+H2 reaction. Similarly, also in the excitable NO+H2 reaction elliptically deformed target patterns and spiral waves were observed in the temperature range from 430 to 490 K. For both reactions the dependence of the front/pulse velocity on temperature and pH(2) was investigated in the direction parallel and perpendicular to the step edges.
AB - The adsorption of oxygen and chemical wave patterns in the O2+H2 and NO+H2 reactions have been studied at p<10-4mbar on an Rh(533) surface. Low energy electron diffraction, Auger electron spectroscopy, thermal desorption spectroscopy and work function measurements with a Kelvin probe served to characterize the integral adsorption behavior, whereas photoemission electron microscopy was used as the spatially resolving method. Oxygen adsorbs on Rh(533) with an initial sticking coefficient of 0.8 at 340 K. Reaction fronts elliptically deformed in the direction parallel to the step edges were found in the bistable O2+H2 reaction. Similarly, also in the excitable NO+H2 reaction elliptically deformed target patterns and spiral waves were observed in the temperature range from 430 to 490 K. For both reactions the dependence of the front/pulse velocity on temperature and pH(2) was investigated in the direction parallel and perpendicular to the step edges.
UR - http://www.scopus.com/inward/record.url?scp=0033363477&partnerID=8YFLogxK
U2 - 10.1016/S0039-6028(99)00783-9
DO - 10.1016/S0039-6028(99)00783-9
M3 - Article
AN - SCOPUS:0033363477
VL - 441
SP - 33
EP - 44
JO - Surface science
JF - Surface science
SN - 0039-6028
IS - 1
ER -