Overlayer Ordering Induced By Carbon-Monoxide Adsorption On Potassium Pre-Covered Ni(100)

Room temperature adsorption of CO on K pre-covered Ni(100) surfaces causes a strong ordering effect, as observed using low energy electron diffraction. This suggests formation of crystalline K/CO overlayers, even at very low K and CO coverages. The results are compared with recent models of the coadsorption process.