In the reduction of NO with H₂ on a Rh(110) surface rectangularly shaped target patterns and spirals with sharp corners have been observed. These patterns can be reproduced with a simple model assuming that the (anisotropic) diffusion is state dependent. Such a dependence is realized in the system Rh(110)/NO + H₂ by the presence of different adsorbate-induced reconstructions with varying substrate geometries.
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Gottschalk et al. (1994) studied this question.
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