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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
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Official URL: http://dx.doi.org/10.1016/j.susc.2012.04.012
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 > Physics | ||||
| Journal or Publication Title: | Surface Science | ||||
| Publisher: | Elsevier BV | ||||
| ISSN: | 0039-6028 | ||||
| Official Date: | August 2012 | ||||
| Dates: |
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| 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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