Abstract
The structure of CO adsorbed on Pt(111) and Pt(100) surfaces at 90 and 30 K was investigated with atomically resolved scanning tunneling microscopy in an ultra-high vacuum environment. The following CO adlayers on Pt(111) and Pt(100) surfaces were formed: c(4 × 2) and c(✓3 × 5) rect, and quasi-c( 5✓2 × ✓2)R45° and c( 3✓2 × ✓2)R45° structures, respectively. The images for c(4 × 2)-CO on the Pt(111) surface showed clear evidence for the existence of both on-top and bridge-bonded species. This is in agreement with previous infrared reflection absorption spectroscopy (IRAS) as well as low-energy electron diffraction studies. The image for c( 3✓2 × ✓2)R45°-CO on the Pt(100) surface, however, revealed evidence of the presence of both on-top and asymmetric on-top species. This is not compatible with previous IRAS assignments.
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