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High energy resolution X-ray absorption spectroscopy of environmentally relevant lead(II) compounds
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2009 (English)In: Inorganic chemistry, ISSN 1520-510X, Vol. 48, no 22, 10748-10756 p.Article in journal (Refereed) Published
Abstract [en]

The determination of the chemical environment of Pb in natural samples is a challenge of great importance in environmental and health physics. We report a high energy resolution fluorescence detection (HERFD) X-ray absorption near-edge spectroscopy (XANES) study at the Pb L(3) and L(1) absorption edges to determine the chemical environment of Pb in a series of model and environmentally relevant compounds. HERFD spectroscopy can reveal increased spectral detail due to an apparent reduction in the core hole lifetime broadening. HERFD spectra of model Pb(II) compounds were compared to FEFF 8.4 multiple scattering calculations with reduced peak broadening parameters, and density of state (DOS) simulations, to determine the origins of the spectral features. A pre-edge in the L(3) XANES is revealed which is shown to arise from hybridization between the Pb p and d states. HERFD spectra of Pb(II)-containing environmentally relevant solutions were compared to model spectra and calculations. The results presented in this paper show that the chemical environment of Pb can be identified from spectral features resolved in HERFD spectroscopy at the Pb L(3) edge. The technique provides information that is complementary to conventional extended X-ray absorption fine structure (EXAFS) spectroscopy.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2009. Vol. 48, no 22, 10748-10756 p.
National Category
Chemical Sciences
URN: urn:nbn:se:umu:diva-27675DOI: 10.1021/ic9015299PubMedID: 19839575OAI: diva2:276961
Available from: 2009-11-13 Created: 2009-11-13 Last updated: 2012-06-04Bibliographically approved

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Karlsson, Torbjörn
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