Oxygen adsorption on Pt(110)-(1x2): new high-coverage structures

From an interplay between scanning tunneling microscopy (STM) experiments a nd density functional theory (DFT) calculations, a comprehensive picture is obtained for oxygen adsorption on the Pt(110)-(1 x 2) surface, from single isolated oxygen atoms chemisorbed in FCC sites along the platinum ridges t o the formation of a new high-coverage oxide-like structure with a local co verage of two oxygen atoms per platinum surface atom. We find that the repu lsive O-O interactions for the O/Pt(110) system are compensated by an effec tive O-O attractive interaction originating from a strong coupling between oxygen adsorption and platinum lattice distortions. (C) 1999 Elsevier Scien ce B.V. All rights reserved.