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X-Ray Absorption Near Edge Structure Spectra as a basis for the speciation of lead

G L Bovenkamp1,3, A Prange2,3, A Roy3, W Schumacher5 and J Hormes1,3,4

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For this study several inorganic lead (II) compounds were measured at the Pb-L3-(13035 eV), L1- (15860 eV) and M5- (2484 eV) edge using X-Ray Absorption Near Edge Structure Spectroscopy (XANES) to determine experimentally which edge is most sensitive to the coordination environment. Each edge probes a different electronic configuration because of the selection rules and has a different resolution because of life-time broadening. Pb-L1-XANES spectra are only sensitive to the first coordination shell. Pb-M5-XANES spectra show a better energy resolution which is due to decreased lifetime broadening, but the pure lead spectra are also sensitive only to the first coordination shell. Spectra at the Pb-L3-edge show the highest sensitivity: differences in coordination out to the third shell could be distinguished. Therefore, even though Pb-L1- and M5-edges have some advantages, because of physical conditions compared to the L3-edge, these advantages do not result in increased sensitivity.


PACS

78.70.Dm X-ray absorption spectra

Subjects

Condensed matter: electrical, magnetic and optical

Dates

Issue 1 (2009)



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