Remarkably long-ranged repulsive interaction between adsorbed CO molecules on Pt modified Ge(001)

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Kockmann, Daan and Poelsema, Bene and Zandvliet, Harold J.W. (2008) Remarkably long-ranged repulsive interaction between adsorbed CO molecules on Pt modified Ge(001). Physical Review B: Condensed matter and materials physics, 78 (24). p. 245421. ISSN 1098-0121

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Abstract:We have studied the adsorption of CO molecules on a Pt modified Ge(001) surface at 77 K. The CO molecules preferentially adsorb on the self-organized Pt chains rather than on the terraces. We have identified two different adsorption sites at 77 K: one either on the short-bridge site or on top of one of the atoms of a buckled Pt dimer, and the other one on the long-bridge site in between two Pt dimers. The CO molecules are mobile at room temperature but immobile at 77 K. A statistical analysis of the nearest-neighbor spacing of the CO molecules reveals that adsorbed CO molecules interact repulsively along the Pt-dimer chains. This repulsive interaction, composed of electrostatic terms and a strain-mediated term, gradually fades away over, for simple molecules, a remarkably long distance of 3–4 nm.
Item Type:Article
Copyright:© 2008 The American Physical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/73053
Official URL:http://dx.doi.org/10.1103/PhysRevB.78.245421
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