THE INTERACTION OF CARBON DIOXIDE WITH SINGLE CRYSTAL CaO(100) SURFACES

C. S. Doyle (), T. Kendelewicz, X. Carrier and G. E. Brown
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C. S. Doyle: Department of Geological and Environmental Sciences, Stanford University, Stanford, CA, 94305-2115, USA
T. Kendelewicz: Department of Geological and Environmental Sciences, Stanford University, Stanford, CA, 94305-2115, USA
X. Carrier: Department of Geological and Environmental Sciences, Stanford University, Stanford, CA, 94305-2115, USA
G. E. Brown: Department of Geological and Environmental Sciences, Stanford University, Stanford, CA, 94305-2115, USA;

Surface Review and Letters (SRL), 1999, vol. 06, issue 06, 1247-1254

Abstract: We have carried out synchrotron-based photoemission spectroscopy (O1s,C1s,Ca2p,Ca3p/O2s/VB) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy (CK-edge) study of the interaction ofCO2with UHV-cleaved synthetic single crystal CaO(100) surfaces. Our data are compared with data collected from a high quality natural sample of${\rm CaCO}_3 (10 {\bar 1}4)$(calcite). The CaO (100) surface readily undergoes hydroxylation with the ambientpH2Oassociated with most UHV systems. Carbon coverages were observed to be lower for the most hydroxylated sample. Comparison of our CK-edge data forCO2/CaO(100)and calcite indicates that there is formation of a surface carbonate species atCO2pressures above10-6Torr. The reaction of CaO(100) withCO2occurs at far lowerCO2pressures than for MgO(100), which is consistent with equilibrium thermodynamic predictions.

Date: 1999
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DOI: 10.1142/S0218625X99001402

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