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We explore the effect of spatiotemporally varying substrate temperatureprofiles on the dynamics and resulting reaction rate enhancement for thecatalytic oxidation of CO on Pt(110). The catalytic surface is "addressed" by afocused laser beam whose motion is computer-controlled. The averaged reactionrate is observed to undergo a characteristic maximum as a function of the speedof this moving laser spot. Experiments as well as modelling are used to exploreand rationalize the existence of such an optimal laser speed.

Enhancement of surface activity in CO oxidation on Pt(110) through spatiotemporal laser actuation