Abstract
In-situ scanning tunneling microscopy (STM) combined with infrared reflection absorption spectroscopy (IRAS) has been used to investigate the structural changes of the CO adlayers adsorbed on Ru(0001) in solution. At a low CO coverage, we found that a ( 3 × 3 ) R30° structure with a coverage of 0.33 ML formed, where all the CO molecules occupy on-top sites. A further increase in the CO coverage gave rise to the formation of a new c(2×2)-2CO structure with a coverage of 0.5 ML as the saturation phase where CO molecules occupy both the on-top and threefold hollow sites. Our STM image clearly demonstrates that one of the threefold hollow sites remains unoccupied in the c(2×2)-2CO saturation adlayer.
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