Abstract
The interaction CO with a clean Pt(111) surface at adsorption temperatures between 85 and 300 K has been studied with infrared reflection-absorption spectroscpy (IRAS) as well as with TPD and LEED. In accordance with electron energy loss data, bands due to the C-O stretch are found in both the linear and bridging regions. The high resolution of IRAS shows, however, that there are two distinct bands in the bridging region which can be assigned to CO in two-fold bridge and three-fold hollow sites. The results suggest a facile interconversion between the two species which is promoted by the occupation of excited states of the low frequency high-amplitude bending modes (frustrated translations). This accounts in turn for the increasing disorder observed with LEED at higher adsorption temperatures. For coverages above Φ=0.5, where a continous splitting of the extra LEED features is observed, the relative intensities of bands in the bridging and linear regions favour the “fault-line” description of Avery rather than the incommensurate layer model.
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