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REACTION OF WATER WITH CLEAN SURFACES OF MnO(100)

Author

Listed:
  • T. KENDELEWICZ

    (Department of Geological & Environmental Sciences, Stanford University, Stanford, CA 94305-2115, USA)

  • C. S. DOYLE

    (Department of Geological & Environmental Sciences, Stanford University, Stanford, CA 94305-2115, USA)

  • X. CARRIER

    (Department of Geological & Environmental Sciences, Stanford University, Stanford, CA 94305-2115, USA)

  • G. E. BROWN

    (Department of Geological & Environmental Sciences, Stanford University, Stanford, CA 94305-2115, USA;
    Stanford Synchrotron Radiation Laboratory, SLAC, PO Box 4349, Stanford University, Stanford, CA 94309, USA)

Abstract

Water adsorption on the MnO(100) single crystal surface was quantitatively monitored using chemical shifts in the O 1s core level spectra. We find that the initial reactions at low water vapor pressures of10-8–10-4Torr are limited to a small fraction of a monolayer and involve dissociation of water at or near defect centers resulting in surface hydroxyls. Even at these low pressures, there is an increase in water adsorption with increasing dosing time. Water uptake increases dramatically for vapor pressures between10-4and10-2Torr and then stabilizes above10-2Torr. At this pressure, hydroxyl coverages slightly exceed a monolayer. Hydroxyl species formed on this surface are unstable and can be removed by annealing to 200°C. These data are compared with those from similar studies of the interaction of water vapor with MgO(100) and the surfaces of iron oxides (α-Fe2O3andFe3O4), and some quantitative similarities and differences are discussed. In particular, the role of cooperative interactions in the condensed water overlayer in surface hydroxylation is emphasized.

Suggested Citation

  • T. Kendelewicz & C. S. Doyle & X. Carrier & G. E. Brown, 1999. "REACTION OF WATER WITH CLEAN SURFACES OF MnO(100)," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 6(06), pages 1255-1263.
    • Handle: RePEc:wsi:srlxxx:v:06:y:1999:i:06:n:s0218625x99001414
    DOI: 10.1142/S0218625X99001414
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