The oxidation of Mo(100) studied by XPS and surface Raman spectroscopy

the onset of MoO2 formation and the formation of surface polymolybdate

George H. Smudde, Peter C Stair

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

Oxidation of the Mo(100) single crystal surface at 700-900 K with molecular oxygen has been studied in ultrahigh vacuum using X-ray photoelectron spectroscopy (XPS) and surface Raman spectroscopy. Whereas the onset of oxide formation was previously found to occur at oxygen coverages just over one monolayer, the nucleation of crystalline MoO2 requires a threshold oxide thickness between 6 and 8 Å, just over one unit cell thick, as indicated by the pronounced appearance of MoO2 features in the surface Raman spectrum. After extensive oxidation at low oxygen pressures the formation of Mo6+ was observed by XPS. Contrary to previous conclusions the Mo6+ does not appear to be due to the formation of MoO3 but is associated with surface polymolybdate species on the oxidized surface.

Original languageEnglish
Pages (from-to)65-72
Number of pages8
JournalSurface Science
Volume317
Issue number1-2
DOIs
Publication statusPublished - Sep 20 1994

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Raman spectroscopy
X ray photoelectron spectroscopy
photoelectron spectroscopy
Oxidation
oxidation
Oxides
oxygen
x rays
Oxygen
Single crystal surfaces
oxides
Molecular oxygen
Ultrahigh vacuum
crystal surfaces
ultrahigh vacuum
Raman scattering
Monolayers
Nucleation
nucleation
Raman spectra

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

The oxidation of Mo(100) studied by XPS and surface Raman spectroscopy : the onset of MoO2 formation and the formation of surface polymolybdate. / Smudde, George H.; Stair, Peter C.

In: Surface Science, Vol. 317, No. 1-2, 20.09.1994, p. 65-72.

Research output: Contribution to journalArticle

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