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

Author

Listed:
  • 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;
    Stanford Synchrotron Radiation Laboratory, SLAC, Stanford, CA, 94309, USA)

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.

Suggested Citation

  • C. S. Doyle & T. Kendelewicz & X. Carrier & G. E. Brown, 1999. "THE INTERACTION OF CARBON DIOXIDE WITH SINGLE CRYSTAL CaO(100) SURFACES," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 6(06), pages 1247-1254.
    • Handle: RePEc:wsi:srlxxx:v:06:y:1999:i:06:n:s0218625x99001402
    DOI: 10.1142/S0218625X99001402
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