Abstract
The weak adsorption state of CO molecules on a Si(001)-c(4×2) surface at the temperature of 75K has been investigated by means of scanning tunneling microscopy (STM). Lateral expansion of CO-adsorbed islands and preferential formation of a weakly adsorbed state near the CO adsorbed islands were directly observed with STM at low CO exposure. We found that the weakly adsorbed CO is desorbed from the surface when CO exposure is stopped. At high CO exposure, we observed multilayered CO islands, which disappeared after cessation of CO exposure.
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