The adsorption of methyl radicals on oxygen-modified Mo(100) studied by HREELS

B. R. Parker, J. F. Jenkins, Peter C Stair

Research output: Contribution to journalArticle

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Abstract

The adsorption of methyl radicals on two different oxygen-modified Mo(100) surfaces at room temperature has been studied using high-resolution electron energy-loss spectroscopy (HREELS) and low-energy electron diffraction (LEED). Previous experiments have shown that methyl radicals adsorbed to these surfaces produce CH4, H2 and CO as reaction products. Since the data from this earlier study was inconclusive, vibrational spectroscopic evidence was sought in order to obtain a chemical identification of the surface species. This study confirms the previous data, which suggested that methyl radicals do not form surface methoxy but rather a metal alkyl analog when adsorbed at 300 K. Methyl groups dehydrogenate at room temperature and reveal an O-H stretching vibration as well as the CH2 scissor mode. This data is compared to the results observed when CH3OH is adsorbed on the same surface. In the latter case, no O-H vibrations are detected in the spectrum and modes corresponding to adsorbed methoxy are seen.

Original languageEnglish
Pages (from-to)185-192
Number of pages8
JournalSurface Science
Volume372
Issue number1-3
Publication statusPublished - Feb 10 1997

Fingerprint

Electron energy loss spectroscopy
energy dissipation
electron energy
Oxygen
Adsorption
adsorption
high resolution
oxygen
spectroscopy
vibration
Low energy electron diffraction
room temperature
Carbon Monoxide
Reaction products
reaction products
Stretching
electron diffraction
Metals
methyl radical
analogs

Keywords

  • Alkanes
  • Electron energy loss spectroscopy
  • Molybdenum
  • Single crystal surfaces
  • Surface chemical reaction

ASJC Scopus subject areas

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

Cite this

The adsorption of methyl radicals on oxygen-modified Mo(100) studied by HREELS. / Parker, B. R.; Jenkins, J. F.; Stair, Peter C.

In: Surface Science, Vol. 372, No. 1-3, 10.02.1997, p. 185-192.

Research output: Contribution to journalArticle

Parker, B. R. ; Jenkins, J. F. ; Stair, Peter C. / The adsorption of methyl radicals on oxygen-modified Mo(100) studied by HREELS. In: Surface Science. 1997 ; Vol. 372, No. 1-3. pp. 185-192.
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