Direct observation of mobility and interactions of oxygen molecules chemisorbed on the Ag(110) surface

J. V. Barth, T. Zambelli, J. Wintterlin, R. Schuster, and G. Ertl
Phys. Rev. B 55, 12902 – Published 15 May 1997
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Abstract

The energetics of thermal motions and interactions of oxygen molecules chemisorbed on a Ag(110) surface were investigated by scanning tunneling microscopy at 60–100 K. Surface mobility is anisotropic, preferably in the [11-bar0] direction with an activation energy of 0.22±0.05 eV and a preexponential factor of 1×1013±3 s1. Along the [11-bar0] direction a repulsive interaction between nearest neighbors of about 0.02 eV and an attraction of 0.04±0.01 eV between next nearest neighbors were derived. Along [001] appreciable repulsion exists between nearest neighbors, while a ``diagonal'' arrangement of molecules is associated with an attraction of 0.02±0.01 eV. The data are indicative for the operation of indirect, substrate-mediated molecule-molecule interactions.

  • Received 10 January 1997

DOI:https://doi.org/10.1103/PhysRevB.55.12902

©1997 American Physical Society

Authors & Affiliations

J. V. Barth, T. Zambelli, J. Wintterlin, R. Schuster, and G. Ertl

  • Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany

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Issue

Vol. 55, Iss. 19 — 15 May 1997

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