Abstract
The chemisorptive properties of carbon monoxide on the Pt(111) crystal face were observed to change markedly in the presence of potassium. Upon deposition of half a monolayer of potassium the saturation coverage adsorption energy of CO increased from 27 to 39 kcal/mol. High-resolution electron energy loss spectroscopy (HREELS) showed a 475-cm-1 decrease in the bridge bonded CO vibrational frequency to as low as 1400 cm-1, while CO preferentially occupied bridge bonded rather than linearly bonded surface sites in the presence of potassium. These large variations appear to be caused by enhanced electron back-donation from the platinum into the 2π* antibonding orbitals of CO.
| Original language | English |
|---|---|
| Pages (from-to) | 310-313 |
| Number of pages | 4 |
| Journal | Journal of Physical Chemistry |
| Volume | 86 |
| Issue number | 3 |
| Publication status | Published - 1982 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
Cite this
Garfunkel, E., Crowell, J. E., & Somorjai, G. A. (1982). The strong influence of potassium on the adsorption of CO on platinum surfaces. A thermal desorption spectroscopy and high-resolution electron energy loss spectroscopy study. Journal of Physical Chemistry, 86(3), 310-313.