title: Quantitative measurements of adsorbate-adsorbate interactions at solid-liquid interfaces.
abstract: The interactions between adsorbates at a solid-liquid interface were studied by video-rate STM for the case of sulfur on Cu(100) electrode surfaces in HCl solution. Quantitative data were obtained by analyzing the S(ad) dimer dynamics within the surrounding c(2 x 2)-Cl adlattice as well as the adsorbate configurations. The interactions are repulsive for S(ad) separated by one or two lattice spacings and attractive at a separation of square root of 2 with energies comparable to adsorbates at the solid-vacuum interface. The S(ad) diffusion barriers are significantly reduced in the vicinity of a neighboring adsorbate.
authors.affiliation: Institut für Experimentelle und Angewandte Physik, Universität Kiel, Olshausenstr. 40, 24098 Kiel, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Taranovskyy
authors.forename: T
authors.initials: T
authors.lastname: Tansel
authors.forename: O M
authors.initials: OM
authors.lastname: Magnussen