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

Daniela Schön, Jie Xiao, Ronny Golnak, Marc F. Tesch, Bernd Winter, Juan Jesus Velasco-Velez, Emad F. Aziz

Research output: Contribution to journalLetterpeer-review

17 Scopus citations


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.

Original languageEnglish
Pages (from-to)2087-2092
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number9
StatePublished - 4 May 2017
Externally publishedYes


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