Sequential oxidation of Fe(100) by water adsorption: formation of an ordered hydroxylated surface

Wei Hsiu Hung, Jeffrey Schwartz, Steven L. Bernasek

Research output: Contribution to journalArticle

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Abstract

The adsorption of H2O and its decomposition on clean Fe(100) have been studied using low-energy electron diffraction (LEED), temperature programmed desorption (TPD), and high-resolution electron energy loss spectroscopy (EELS). Water adsorbs molecularly on the surface at 100 K and desorbs from three states at 165, 220, and 310 K. EELS and TPD data suggest that the Fe(100) surface interacts sequentially with water, forming hydrogen-bonded molecular clusters at low temperature and low coverage. As the surface is warmed, wetting occurs as the clusters break apart, and molecular water begins to dissociate. Dissociation is complete at a temperature of 250 K, forming a p(1 × 2)-OH overlayer, with the OH bond tilted from the surface normal. The hydroxyl overlayer disproportionates or decomposes resulting in water or hydrogen desorption near 310 K. Oxygen remaining on the surface following this desorption is bound in the fourfold hollow site, as has been observed for oxidation of this surface by O2.

Original languageEnglish
Pages (from-to)332-342
Number of pages11
JournalSurface Science
Volume248
Issue number3
DOIs
Publication statusPublished - 1991 Jun 1

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Adsorption
Oxidation
oxidation
adsorption
Water
desorption
water
Electron energy loss spectroscopy
Temperature programmed desorption
Hydrogen
Desorption
energy dissipation
electron energy
molecular clusters
Low energy electron diffraction
hydrogen
Hydroxyl Radical
spectroscopy
wetting
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Sequential oxidation of Fe(100) by water adsorption : formation of an ordered hydroxylated surface. / Hung, Wei Hsiu; Schwartz, Jeffrey; Bernasek, Steven L.

In: Surface Science, Vol. 248, No. 3, 01.06.1991, p. 332-342.

Research output: Contribution to journalArticle

Hung, Wei Hsiu ; Schwartz, Jeffrey ; Bernasek, Steven L. / Sequential oxidation of Fe(100) by water adsorption : formation of an ordered hydroxylated surface. In: Surface Science. 1991 ; Vol. 248, No. 3. pp. 332-342.
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