Köhler L, Kresse G, Schmid M, Lundgren E, Gustafson J, Mikkelsen A, Borg M, Yuhara J, Andersen JN, Marsman M, Varga P. High-coverage oxygen structures on Rh111: adsorbate repulsion and site preference is not enough.
Phys Rev Lett 2004;
93:266103. [PMID:
15697994 DOI:
10.1103/physrevlett.93.266103]
[Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2004] [Indexed: 05/24/2023]
Abstract
A new O induced structure on Rh(111) displaying a (2 sqaureroot[3] x 2sqaureroot[3])R30 degrees periodicity with an oxygen coverage of 2/3 has been studied by high resolution core level spectroscopy, scanning tunneling microscopy, and density functional theory. Although O favors fcc hollow sites in all other known phases, it occupies both fcc and hcp sites in this structure, which cannot be explained by pairwise adsorbate repulsion only. Both the (2sqaureroot[3] x 2sqaureroot[3])R30 degrees and (2 x 2)-3O structures also exemplify that density-of-states contrast can lead to oxygen adatoms appearing as protrusions in scanning tunneling microscopy images.
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