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  Does methanol produce a stable methoxy species on Ru(0001) at low temperatures?

Duncan, D., Unterberger, W., Kreikemeyer-Lorenzo, D., & Woodruff, D. P. (2012). Does methanol produce a stable methoxy species on Ru(0001) at low temperatures? Surface science, 606(15-16), 1298-1302. doi:10.1016/j.susc.2012.04.012.

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 Urheber:
Duncan, D.A.1, Autor
Unterberger, Werner2, Autor           
Kreikemeyer-Lorenzo, Dagmar2, Autor           
Woodruff, David Phillip1, Autor           
Affiliations:
1Physics Department, University of Warwick, Coventry, CV4 7AL, United Kingdom, ou_persistent22              
2Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              

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Schlagwörter: Chemisorption; Surface structure; Photoelectron diffraction; Ruthenium; Methanol
 Zusammenfassung: Soft X-ray photoelectron spectroscopy (SXPS) and energy-scanned photoelectron diffraction (PhD) have been used to study the surface species produced by exposure of Ru(0001) to methanol at ~ 150 K. SXPS shows a single surface species is formed at sub-monolayer coverages with an O 1s peak binding energy of ~ 532.6 eV, 2.8 eV greater than that of chemisorbed atomic oxygen. O 1s PhD data from this species shows no significant modulations, in contrast to simulated PhD spectra from a methoxy species occupying a three-fold coordinated hollow site, as predicted by earlier density functional theory calculations, or atop or bridging sites. By contrast, PhD data from the O 1s of the atomic oxygen species in the Ru(0001)(2 × 1)–O phase are consistent with the oxygen atoms occupying ‘hcp’ hollow sites (above second-layer Ru atoms) at a Rusingle bondsingle bondO bondlength of 2.01 ± 0.02 Å, essentially identical to previous structure determinations of this phase. O 1s PhD recorded at normal emission from adsorbed CO are also consistent with the known CO atop adsorption species. We conclude that the methanol-derived surface molecular species is not methoxy in a well-defined local site on the surface, but is consistent with clusters of intact methanol identified in a recent infrared spectroscopy investigation.

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Sprache(n): eng - English
 Datum: 2012-01-232012-04-102012-04-212012-08
 Publikationsstatus: Erschienen
 Seiten: 5
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1016/j.susc.2012.04.012
 Art des Abschluß: -

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Titel: Surface science
  Kurztitel : Surf. Sci.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Amsterdam : Elsevier
Seiten: - Band / Heft: 606 (15-16) Artikelnummer: - Start- / Endseite: 1298 - 1302 Identifikator: Anderer: 0039-6028
CoNE: https://pure.mpg.de/cone/journals/resource/0039-6028