On the Nature of the${\rm O}\mbox{-}{\rm C\lc{o}}(10\bar{1}0)$Triphase Ordering

Chang Q. Sun ()
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Chang Q. Sun: Surface Technology, Gintic Institute of Manufacturing Technology, Nanyang Technological University, Singapore 638075, Singapore

Surface Review and Letters (SRL), 1998, vol. 05, issue 05, 1023-1028

Abstract: It is shown that the model for oxygen chemisorption improves our understanding of the${\rm O}\mbox{-}{\rm C\lc{o}}(10\bar{1}0)$surface reaction. The disorderedp(2×1)-O precursor is identified as molecule adsorption in which the pairedO-1rests on top of the surface along the close-packed direction. Meanwhile,O-1polarizes its rest neighbors, leading to the protruding domain boundaries. At higher coverage,c(2×4)-4O and thenp(2×1)-2O develop due toO-2hybridization.O-2is located at a threefold hollow site and forms a tetrahedron with two Co atoms at the surface and one atom in the second layer. The lack of one atom of bonding is compensated for by an electron cloud of dipoles; namely, a virtual bond forms. The virtual bonding lowers the STM protrusions and narrows the antibonding band.

Keywords: 64.60.Qb; 64.70.Kb; 68.35.Md (search for similar items in EconPapers)
Date: 1998
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DOI: 10.1142/S0218625X98001389

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