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.
%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
}