Chemical wave patterns that develop in the O + H reaction on a bimetallic Rh(110)/Ni surface have been studied with photoelectron emission microscopy (PEEM) in the 10 to 10 mbar range. The bifurcation diagram for Ni coverages up to 3 monolayers (ML) was mapped out for = 770 K. Stationary concentration patterns of macroscopic stripes as well as target patterns and irregular chemical waves were observed.
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