Structure of oxygen adsorbed on Mo(100) studied by high-resolution electron energy-loss spectroscopy

Seong H. Kim, Peter C Stair

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Oxygen-modified Mo(100) surfaces with coverages from 0.8 to 1.4 monolayers (ML), prepared by high-temperature annealing, have been investigated using high-resolution electron energy loss spectroscopy (HREELS). The surface with 0.8 ML coverage, a (√5 × √5)-R26°33 minutes low-energy electron diffraction (LEED) pattern, produces a three-peak pattern associated with modes derived from oxygen located in a three-coordinate site. With increasing oxygen coverage up to 1.1 ML and a change in the LEED pattern to (2 × 1), the three-peak pattern persists which indicates that the three-coordinate O/Mo structural motif is preserved. As the oxygen coverage exceeds 1 ML, an additional loss peak due to oxygen located on an atop site appears at 985 cm-1. At 1.4 ML the HREELS spectrum is very similar to the vibrational spectrum of MoO2, consistent with the formation of this oxide phase. Time-dependent HREELS measurements at 300 K and coverages ≤ 1 ML reveal a gradual clustering of adsorbed oxygen and relocation from three-coordinate sites to atop sites.

Original languageEnglish
JournalSurface Science
Volume457
Issue number1
DOIs
Publication statusPublished - Jun 1 2000

Fingerprint

Electron energy loss spectroscopy
Monolayers
energy dissipation
electron energy
Oxygen
high resolution
oxygen
spectroscopy
Low energy electron diffraction
Diffraction patterns
diffraction patterns
electron diffraction
relocation
Relocation
Vibrational spectra
Oxides
vibrational spectra
Annealing
annealing
oxides

ASJC Scopus subject areas

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

Cite this

Structure of oxygen adsorbed on Mo(100) studied by high-resolution electron energy-loss spectroscopy. / Kim, Seong H.; Stair, Peter C.

In: Surface Science, Vol. 457, No. 1, 01.06.2000.

Research output: Contribution to journalArticle

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N2 - Oxygen-modified Mo(100) surfaces with coverages from 0.8 to 1.4 monolayers (ML), prepared by high-temperature annealing, have been investigated using high-resolution electron energy loss spectroscopy (HREELS). The surface with 0.8 ML coverage, a (√5 × √5)-R26°33 minutes low-energy electron diffraction (LEED) pattern, produces a three-peak pattern associated with modes derived from oxygen located in a three-coordinate site. With increasing oxygen coverage up to 1.1 ML and a change in the LEED pattern to (2 × 1), the three-peak pattern persists which indicates that the three-coordinate O/Mo structural motif is preserved. As the oxygen coverage exceeds 1 ML, an additional loss peak due to oxygen located on an atop site appears at 985 cm-1. At 1.4 ML the HREELS spectrum is very similar to the vibrational spectrum of MoO2, consistent with the formation of this oxide phase. Time-dependent HREELS measurements at 300 K and coverages ≤ 1 ML reveal a gradual clustering of adsorbed oxygen and relocation from three-coordinate sites to atop sites.

AB - Oxygen-modified Mo(100) surfaces with coverages from 0.8 to 1.4 monolayers (ML), prepared by high-temperature annealing, have been investigated using high-resolution electron energy loss spectroscopy (HREELS). The surface with 0.8 ML coverage, a (√5 × √5)-R26°33 minutes low-energy electron diffraction (LEED) pattern, produces a three-peak pattern associated with modes derived from oxygen located in a three-coordinate site. With increasing oxygen coverage up to 1.1 ML and a change in the LEED pattern to (2 × 1), the three-peak pattern persists which indicates that the three-coordinate O/Mo structural motif is preserved. As the oxygen coverage exceeds 1 ML, an additional loss peak due to oxygen located on an atop site appears at 985 cm-1. At 1.4 ML the HREELS spectrum is very similar to the vibrational spectrum of MoO2, consistent with the formation of this oxide phase. Time-dependent HREELS measurements at 300 K and coverages ≤ 1 ML reveal a gradual clustering of adsorbed oxygen and relocation from three-coordinate sites to atop sites.

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