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

Wei Hsiu Hung*, Jeffrey Schwartz, Steven L. Bernasek

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

68 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
頁(從 - 到)332-342
頁數11
期刊Surface Science
248
發行號3
DOIs
出版狀態已發佈 - 1991 六月 1

ASJC Scopus subject areas

  • 凝聚態物理學
  • 表面和介面
  • 表面、塗料和薄膜
  • 材料化學

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