%0 Journal Article %1 Rupprechter2001 %A Rupprechter, G. %A Dellwig, T. %A Unterhalt, H. %A Freund, H.-J. %D 2001 %J J. Phys. Chem. B %K CO, Pt(111), SFG, adsorption, high platinum pressure;, science, surface %P 3797�3802 %R 10.1021/jp003585s %T High-Pressure Carbon Monoxide Adsorption on Pt(111) Revisited: A Sum Frequency Generation Study %U http://dx.doi.org/10.1021/jp003585s %V 105 %X The adsorption of CO on Pt(111) was studied by picosecond infrared-visible sum frequency generation (SFG) vibrational spectroscopy in a pressure range from 10-7 to 500 mbar and in a temperature range of 160-400 K. At low pressure the experiments were complemented by TPD, LEED, and AES. Terminally bonded (on-top) CO was the only species observed between 160 and 400 K, independent of gas pressure. The CO stretching frequency was blue-shifted by about 15 cm-1 with increasing pressure (up to 2097 cm-1), but no evidence for high-pressure CO species or surface roughening was found. The influence of defects was also investigated. CO adsorption on a defective (nonannealed) Pt(111) surface yielded peaks that were slightly broadened but otherwise identical to the defect-free surface. At 160 K, a second peak at 2085 cm-1 evolved above 50 mbar of CO. TPD revealed that under these conditions residual (contaminant) water adsorbs on the surface. The coadsorption of water and CO red-shifted the terminal CO peak by about 15 cm-1, resulting from the substrate-mediated interaction of CO and water.

@article{Rupprechter2001, abstract = {The adsorption of CO on Pt(111) was studied by picosecond infrared-visible sum frequency generation (SFG) vibrational spectroscopy in a pressure range from 10-7 to 500 mbar and in a temperature range of 160-400 K. At low pressure the experiments were complemented by TPD, LEED, and AES. Terminally bonded (on-top) CO was the only species observed between 160 and 400 K, independent of gas pressure. The CO stretching frequency was blue-shifted by about 15 cm-1 with increasing pressure (up to 2097 cm-1), but no evidence for high-pressure CO species or surface roughening was found. The influence of defects was also investigated. CO adsorption on a defective (nonannealed) Pt(111) surface yielded peaks that were slightly broadened but otherwise identical to the defect-free surface. At 160 K, a second peak at 2085 cm-1 evolved above 50 mbar of CO. TPD revealed that under these conditions residual (contaminant) water adsorbs on the surface. The coadsorption of water and CO red-shifted the terminal CO peak by about 15 cm-1, resulting from the substrate-mediated interaction of CO and water.}, added-at = {2009-10-30T10:04:05.000+0100}, author = {Rupprechter, G. and Dellwig, T. and Unterhalt, H. and Freund, H.-J.}, biburl = {https://www.bibsonomy.org/bibtex/2c2bf24a247b6f1580d7b15f99e93eb19/jfischer}, doi = {10.1021/jp003585s}, interhash = {e1400d2322f3f88a1a207648d71cdf97}, intrahash = {c2bf24a247b6f1580d7b15f99e93eb19}, journal = {J. Phys. Chem. B}, keywords = {CO, Pt(111), SFG, adsorption, high platinum pressure;, science, surface}, pages = {3797�3802}, timestamp = {2009-10-30T10:04:18.000+0100}, title = {High-Pressure Carbon Monoxide Adsorption on Pt(111) Revisited: A Sum Frequency Generation Study}, url = {http://dx.doi.org/10.1021/jp003585s}, volume = 105, year = 2001 }