Hydrohalic acid anion interaction with silver surfaces: Ag(100) – iodide
In this chapter the experimental results on adsorption of silver iodide formation on Ag(100) surface is described.
The system has extensively been studied in UHV  and solution. In 0.1 HClO4 + 1 mM KI, cyclic voltammetry and in situ STM yield only an ordered c(2 × 2) phase on Ag(100), with the iodide particles in fourfold hollow sites. With increasing iodide coverage at positive potentials, a 2D silver iodide compound is formed which in STM images appears as a (2√2 × 12√2)R45° superstructure superimposed on the quasi-hexagonal atomic structure.
Etching rates, i.e., silver dissolution of the iodide covered Ag(100) surface, were found to depend on the step direction, suggesting an influence of the adlayer structure near the steps on the dissolution process (see also Cu(100)-Br) [1, 2, 3].
scanning tunneling microscopy
- 1.Teshima, T., Ogaki, K., Itaya, K.: J. Phys. Chem. B 101, 2053 (1997)Google Scholar