Abstract
Optical infrared-visible sum-frequency generation (SFG) surface vibrational spectroscopy was used for in situ detection of CO during heterogeneous CO oxidation on a polycrystalline platinum foil. SFG spectra were recorded in the substrate temperature range 300- 700 K at a total pres- sure of 20 mbar. A least-squares fit procedure was employed to determine the temperature dependence of the vibrationally nonresonant contribution and the frequency, amplitude and halfwidth of the CO vibrationally resonant contribution from the SFG spectra. Thermal desorption measurements were car- ried out to investigate the relationship between the SFG signal and the instantaneous CO surface coverage. After these cal- ibration measurements, it was possible to derive CO surface coverages from the SFG spectra measured under laminar flow conditions during heterogeneous CO oxidation.
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