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Introducing Ionic-Current Detection for X-ray Absorption Spectroscopy in Liquid Cells

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Winter,  Bernd
Institute of Methods for Material Development, Helmholtz-Zentrum Berlin für Materialien und Energie;
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Velasco Vélez,  Juan
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Schön, D., Xiao, J., Golnak, R., Tesch, M. F., Winter, B., Velasco Vélez, J., et al. (2017). Introducing Ionic-Current Detection for X-ray Absorption Spectroscopy in Liquid Cells. The Journal of Physical Chemistry Letters, 8(9), 2087-2092. doi:10.1021/acs.jpclett.7b00646.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-2BFE-2
Abstract
Photons and electrons are two common relaxation products upon X-ray absorption, enabling fluorescence yield and electron yield detections for X-ray absorption spectroscopy (XAS). The ions that are created during the electron yield process are relaxation products too, which are exploited in this study to produce ion yield for XA detection. The ionic currents measured in a liquid cell filled with water or iron(III) nitrate aqueous solutions exhibit characteristic O K-edge and Fe L-edge absorption profiles as a function of excitation energy. Application of two electrodes installed in the cell is crucial for obtaining the XA spectra of the liquids behind membranes. Using a single electrode can only probe the species adsorbed on the membrane surface. The ionic-current detection, termed as total ion yield (TIY) in this study, also produces an undistorted Fe L-edge XA spectrum, indicating its promising role as a novel detection method for XAS studies in liquid cells.