Adsorption and desorption kinetics of CO on Ir(111): bridging the pressure gap

Rates of desorption of CO chemisorbed on Ir(111) were investigated using time-resolved Fourier-transform IR reflection-absorption spectroscopy in combination with an isotopic jump method. Data for desorption into vacuum and desorption in the presence of an ambient CO background pressure were measure...

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Bibliographic Details
Published in:Surface science 1997-12, Vol.393 (1), p.135-140
Main Authors: Sushchikh, M., Lauterbach, J., Weinberg, W.H.
Format: Article
Language:English
Subjects:
Adsorption and desorption kinetics
evaporation and condensation
Adsorption kinetics
Carbon monoxide
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Infrared absorbtion spectroscopy
Iridium
Low index single crystal surfaces
Physics
Solid-fluid interfaces
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Thermal desorption
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Summary:Rates of desorption of CO chemisorbed on Ir(111) were investigated using time-resolved Fourier-transform IR reflection-absorption spectroscopy in combination with an isotopic jump method. Data for desorption into vacuum and desorption in the presence of an ambient CO background pressure were measured at surface temperatures from 390 to 500 K and for a wide range of CO pressures from 1 × 10 −8 to 1 × 10 −5mbar, extending the range of control parameters substantially compared to all other previously reported investigations. The rates of desorption in both cases are essentially identical, and the existence of the frequently discussed phenomenon of “adsorption-assisted desorption” can be excluded for CO on Ir(111).
ISSN:0039-6028
1879-2758
DOI:10.1016/S0039-6028(97)00578-5