AVS 49th International Symposium
    Surface Science Wednesday Sessions
       Session SS-WeP

Paper SS-WeP14
Adsorption and Reaction of NO, CO and O@sub 2@ on Cu(100) at Low Temperatures Studied by Infrared Reflection Absorption Spectroscopy

Wednesday, November 6, 2002, 11:00 am, Room Exhibit Hall B2

Session: Surface Science Poster Session
Presenter: C.-W. Yi, Texas A&M University
Authors: C.-W. Yi, Texas A&M University
C.M. Kim, Kyungpook National University, Korea
D.W. Goodman, Texas A&M University
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The adsorption and reaction of NO, CO, and O2 on Cu (100) have been investigated in the temperature range 21 - 200 K using infrared reflection absorption spectroscopy (IRAS). NO forms dimers within the monolayer and multilayer regime at 21 K. The dimer, in turn, converts to N2O above 60 K. A strong lateral interaction between coadsorbed NO and CO at 21 K results in the NO and CO molecules tilting from the surface normal by approximately 45 degree. CO interacts strongly with chemisorbed dioxygen on Cu(100) within the temperature range 50 - 100 K resulting in the vibrational frequency of CO being blue-shifted by 25 cm-1. These studies provide new insights into the molecular interactions that are precursors to reactions between CO and NO/O2.