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Sensitivity of x-ray absorption spectroscopy to hydrogen bond topology
Stockholm University, Faculty of Science, Department of Physics.
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2009 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 80, no 23, 233404- p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate the sensitivity of x-ray absorption spectroscopy to hydrogen bonding using as experimental model system water on Ru(0001). We stepwise go from fully broken to complete H-bond network by varying the morphology from isolated monomers via two-dimensional clusters to a saturated monolayer as probed by scanning tunneling microscopy. The sensitivity of x-ray absorption to the symmetry of H bonding is further elucidated for the amino (-NH2) group in glycine adsorbed on Cu(110) where the E vector is parallel either to the NH donating an H bond or to the non-H-bonded NH. We show that the pre-edge in the x-ray absorption spectrum is associated with an asymmetric hydrogen-bonding situation while the postedge is directly associated with hydrogen bond formation. The results give further evidence for the much debated interpretation of the various spectral features of liquid water and demonstrate the general applicability of x-ray absorption spectroscopy to analyze H-bonded systems.

Place, publisher, year, edition, pages
2009. Vol. 80, no 23, 233404- p.
Keyword [en]
hydrogen bonds, molecular clusters, molecule-surface impact, monolayers, ruthenium, surface structure, water, X-ray absorption spectra
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-59406DOI: 10.1103/PhysRevB.80.233404ISI: 000273228800015OAI: oai:DiVA.org:su-59406DiVA: diva2:427559
Note
authorCount :7Available from: 2011-06-28 Created: 2011-06-27 Last updated: 2017-12-11Bibliographically approved

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