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Phys. Rev. Lett. 94, 076104 (2005) [4 pages]

Probing Outer-Sphere Adsorption of Aqueous Metal Complexes at the Oxide-Water Interface with Resonant Anomalous X-Ray Reflectivity

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Changyong Park1, Paul A. Fenter1, Neil C. Sturchio1,2, and John R. Regalbuto3
1Environmental Research Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
2Department of Earth and Environmental Sciences, University of Illinois at Chicago, Chicago, Illinois 60607, USA
3Department of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, USA

Received 10 September 2004; published 25 February 2005

Resonant anomalous x-ray reflectivity near the Pt LIII edge simultaneously revealed the geometric and spectroscopic structures of Pt(NH3)42+ ions adsorbed at the quartz(100)-water interface. The derived Pt geometric subprofile shows two discrete “outer-sphere” adsorbed layers, and the interface-specific x-ray absorption edge profile exhibits a significant white-line enhancement compared to the bulk-solution species.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.94.076104
DOI: 10.1103/PhysRevLett.94.076104
PACS: 68.08.De, 61.10.Eq, 68.43.Fg, 82.65.+r

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