Pulse propagation and oscillatory behavior in the NO+H2 reaction on a Rh(110) 
surface

Mertens, F.; Imbihl, R.

doi:10.1063/1.472248

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Pulse propagation and oscillatory behavior in the NO+H₂ reaction on a Rh(110) surface

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Mertens, F.
Fritz Haber Institute, Max Planck Society;

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Citation

Mertens, F., & Imbihl, R. (1996). Pulse propagation and oscillatory behavior in the NO+H₂ reaction on a Rh(110) surface. The Journal of Chemical Physics, 105(10), 4317-4322. doi:10.1063/1.472248.

Cite as: https://hdl.handle.net/21.11116/0000-0009-B4B7-D

Abstract

Target patterns, rotating spiral waves and solitary pulses have been found in the NO+H₂ reaction under nonoscillatory conditions, i.e., when the system was an excitable medium. Using photoelectron emission microscopy (PEEM) as spatially resolving method the parameter dependence of the front velocities, the width of the pulses and the rotational period of the spiral waves were studied for fixed p_NO=1.8×10⁻⁶ mbar in a T‐ range 520–620 K. The front velocities were strongly anisotropic with the degree of anisotropy depending on the p_H₂, T parameters. Under reaction conditions close to the high p_H₂ boundary for pattern formation, gas‐phase coupling becomes efficient, thus, oscillations in the N₂ production rate can be observed.