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On the nature of the O-Rh(110) multiphase ordering

Sun, C.Q. (1998) On the nature of the O-Rh(110) multiphase ordering. Surface Science, 398 (3). L320-L326.

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A new insight into the nature and formation of the O-Rh(110) multiphase ordering is presented. This insight is gained by incorporating the models of bond-to-band and the potential-barrier for oxygen-metal chemisorption [J. Phys. Chem. Solids 58 (1997) 903; J. Phys.: Condensed Matter 9 (1997) 5823] into the outstanding theoretical and experimental observations available to date. It is recognized that the multiphase, i.e. (2 × 1)p2mg, (2 × 1)p2mg and (2 × 2)p2mg, originates from the Rh2O bond forming at different oxygen coverages under this specific bonding circumstance. The three-fold-coordinated O-2 forms a Rh2O tetrahedron with its four neighbors through bonding orbitals and two nonbonding lone pairs. In the (2 × 1)p2mg, the lack of one Rh atom for the tetrahedron is compensated for by a virtual bond. The virtual bond pulls the electron cloud of the dipoles that are induced by lone pairs of other O-2 ions. The tetrahedron in the (2 × 2)pg requires an electron from a Rh atom in the next nearest row at surface. Therefore, the bond network interlocks all the surface atoms and thereby no atom was missing. The zig-zag protrusions in the STM images are recognized as metal dipoles deformed by the lone pairs of O-2 ions. The depressions correspond to Rh+ ions other than missing-row vacancies as had been expected.

Publication Type: Journal Article
Murdoch Affiliation: School of Mathematical and Physical Sciences
Publisher: Elsevier BV
Copyright: © 1998 Elsevier Science B.V.
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