Figure 1.

Potential‐dependent structure of the CO adlayer on Pt(111) in CO‐saturated 0.1 m H₂SO₄ solution. The STM images (3 nm×3 nm) were taken from a video sequence (recorded at 10 images s⁻¹), in which the potential was continuously increased, and were recorded at a) −0.10 V, b) 0.12 V, c) 0.20 V, and d) 0.30 V. Gradual deviations from the (2×2) symmetry (indicated by grid of white lines) are visible with increasing potential, resulting in a modulated (1×1) structure at the most positive potentials.