Journal
THIN SOLID FILMS
Volume 515, Issue 14, Pages 5654-5659Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2006.12.118
Keywords
X-ray scattering; resonant anomalous X-ray refectivity; interfacial structure; liquid-solid interface; ion adsorption; electrical double layer structure
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We discuss new opportunities to understand processes at the solid-liquid interface using resonant anomalous X-ray reflectivity (RAXR). This approach is illustrated by determination of element-specific density profiles at mica surfaces in aqueous electrolyte solutions containing Rb+ and Sr2+. The total interfacial electron density profile is determined by specular reflectivity (i.e., reflected intensity vs. momentum transfer, q, at an energy, E, far from any characteristic absorption edge). RAXR spectra (i.e., intensity vs. E at fixed q) reveal element-specific ion distributions. Key differences in the interaction of Rb+ and Sr2+ with mica are observed using resonant anomalous X-ray reflectivity: Rb+ adsorbs in a partially hydrated state, but Sr2+ adsorbs in both fully and partially hydrated states. (c) 2006 Elsevier B.V. All rights reserved.
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