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

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Duncan, David A., Unterberger, W. (Werner), Kreikemeyer-Lorenzo, D. and Woodruff, D. P. (2012) Does methanol produce a stable methoxy species on Ru(0001) at low temperatures? Surface Science, Vol.606 (No.15-16). pp. 1298-1302. doi:10.1016/j.susc.2012.04.012 ISSN 0039-6028.

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Official URL: http://dx.doi.org/10.1016/j.susc.2012.04.012

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Abstract

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 RuO 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.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title: Surface Science
Publisher: Elsevier BV
ISSN: 0039-6028
Official Date: August 2012
Dates:
DateEvent
August 2012Published
Volume: Vol.606
Number: No.15-16
Page Range: pp. 1298-1302
DOI: 10.1016/j.susc.2012.04.012
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

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