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On low index nickel surfaces, repulsive interactions between atomic oxygen and CO drive the phase separation of these species into oxygen-rich and CO-rich islands. Because these adsorbates interact differently with crystallographic steps, the size and the structure of these islands are modified on stepped surfaces. We have monitored coadsorption-induced changes in the distribution of CO with IRRAS,...
We have obtained the first far infrared measurement of an atomic adsorbate-substrate stretch on a single crystal surface. The infrared reflection-absorption technique is employed onO/Ag(110), with an apparatus consisting of a laboratory source of infrared radiation, an evacuated FTIR, and a He-cooled bolometer detector. Complementary STM measurements, performed in situ, allowed rigorous characterization...
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