Details
| Original language | English |
|---|---|
| Article number | 042206 |
| Number of pages | 9 |
| Journal | Physical Review E |
| Volume | 100 |
| Issue number | 4 |
| Publication status | Published - 7 Oct 2019 |
Abstract
A couple of bistable oxidation reactions on Rh(110), the CH3OH+O2 and the NH3+O2 reactions, exhibit localized excitations at the interface between oxygen-poor and oxygen-rich phase that propagate in a pulselike manner along the interface. A three-variable reaction-diffusion model is set up based on a mechanism that explains the localized excitations as being caused by temporary structural defects generated in the vicinity of the interface. The structural defects are a consequence of different densities of surface atoms in the oxygen-induced reconstruction phases and in the nonreconstructed (1×1) phase. One- and two-dimensional simulations show that traveling interface pulses (TIPs) exist in a region of so-called double metastability adjacent to the equistability point of the bistable system. As in the experiment, we observe triangular-shaped TIPs that move fast along the interface. Diffusional anisotropy is not required for the occurrence of TIPs. All essential features of the experiment are reproduced by the simulations.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Statistical and Nonlinear Physics
- Mathematics(all)
- Statistics and Probability
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Physical Review E, Vol. 100, No. 4, 042206, 07.10.2019.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Simulation of traveling interface pulses in bistable surface reactions
AU - Makeev, Alexei
AU - Imbihl, Ronald
N1 - Funding information: The authors are indebted to the DFG (Deutsche Forschungsgemeinschaft) for financial support.
PY - 2019/10/7
Y1 - 2019/10/7
N2 - A couple of bistable oxidation reactions on Rh(110), the CH3OH+O2 and the NH3+O2 reactions, exhibit localized excitations at the interface between oxygen-poor and oxygen-rich phase that propagate in a pulselike manner along the interface. A three-variable reaction-diffusion model is set up based on a mechanism that explains the localized excitations as being caused by temporary structural defects generated in the vicinity of the interface. The structural defects are a consequence of different densities of surface atoms in the oxygen-induced reconstruction phases and in the nonreconstructed (1×1) phase. One- and two-dimensional simulations show that traveling interface pulses (TIPs) exist in a region of so-called double metastability adjacent to the equistability point of the bistable system. As in the experiment, we observe triangular-shaped TIPs that move fast along the interface. Diffusional anisotropy is not required for the occurrence of TIPs. All essential features of the experiment are reproduced by the simulations.
AB - A couple of bistable oxidation reactions on Rh(110), the CH3OH+O2 and the NH3+O2 reactions, exhibit localized excitations at the interface between oxygen-poor and oxygen-rich phase that propagate in a pulselike manner along the interface. A three-variable reaction-diffusion model is set up based on a mechanism that explains the localized excitations as being caused by temporary structural defects generated in the vicinity of the interface. The structural defects are a consequence of different densities of surface atoms in the oxygen-induced reconstruction phases and in the nonreconstructed (1×1) phase. One- and two-dimensional simulations show that traveling interface pulses (TIPs) exist in a region of so-called double metastability adjacent to the equistability point of the bistable system. As in the experiment, we observe triangular-shaped TIPs that move fast along the interface. Diffusional anisotropy is not required for the occurrence of TIPs. All essential features of the experiment are reproduced by the simulations.
UR - http://www.scopus.com/inward/record.url?scp=85073829220&partnerID=8YFLogxK
U2 - 10.1103/PhysRevE.100.042206
DO - 10.1103/PhysRevE.100.042206
M3 - Article
C2 - 31770951
AN - SCOPUS:85073829220
VL - 100
JO - Physical Review E
JF - Physical Review E
SN - 2470-0045
IS - 4
M1 - 042206
ER -