Abstract
Optical infrared-visible sum frequency generation (SFG) vibrational spectroscopy is one of the few surface-specific techniques that can operate in a pressure range from ultrahigh vacuum to ambient conditions. Due to its inherent surface sensitivity and pressure independence, SFG is particularly suited for in-situ studies of adsorbates or surface species at elevated pressure or during a catalytic reaction. In this progress report we describe the design of an SFG-compatible elevated pressure reactor that is attached to an ultrahigh vacuum (uhv) surface analysis chamber. After preparation and characterization in uhv, model catalysts can be transferred in vacuo into the reaction cell. The reactor is separated from the uhv chamber by an arrangement of differentially pumped teflon seals. In order to test our system, we studied the adsorption of CO and NO on Ni and NiO(100) surfaces at low coverages.
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