X-Ray photoelectron study of the reaction of water with cerium

B. E. Koel, G. Praline, H. I. Lee, J. M. White, R. L. Hance

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Abstract

The interaction of D2 O with a polycrystalline cerium surface, successfully cleaned by heavy Ar+ bombardment and annealing, was studied at 120 were observed at BE 530.3 (Ce2O3) and 532.7eV (adsorbed OD). When clean Ce at 120 K was exposed to D2 O, the O(1s) spectra were initial eV (adsorbed D2 O). For exposures greater than 10 Langmuir (L), a multilayer of ice grows and the O(1s) spectra become dominated by a peak at 5. The results of interaction with D2 O are compared with oxidation by O2. The significant differences are: (1) the absence of Ce(IV) when oxidati relatively small extent of oxidation that occurs when Ce is exposed to D2 O at 120 K, and (3) the larger chemical-shift of the Ce(III)-derived spec. The XPS studies of the interaction of D2 O with Ce reported here may be summarized as follows:. (1) Exposure at 300 K gives rise to O(1s) features characteristic of oxide and hydroxide, while the Ce(3d) spectra indicate Ce(III), but no CE(. (2) Exposure at 120 K gives O(1s) features characteristic of adsorbed OD, chemisorbed D2 O, a multilayer of ice, and a small amount of oxide. T are characteristic of clean Ce except for slight broadening. (3) Exposure at 120 K followed by warming to 240 and 300 K gives spectra characteristic of hydroxide and oxide surface-species. Between 240 and 300 K, O(1s) intensity. (4) At 300 K, a relatively thick layer of oxide forms, and after an exposure of 50 L the features characteristic of metallic Ce are no longer observabl. (5) As compared to the case for O2, exposure to D2 O gives rise to different satellite-splittings in the Ce(3d) spectra, suggesting that di formed in the two cases. (6) The spectra observed for Ce exposed to D2 O are in excellent accord with those found for the heavier lanthanides [4].

Original languageEnglish (US)
Pages (from-to)31-46
Number of pages16
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume21
Issue number1
DOIs
StatePublished - Jan 1 1980
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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