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This study introduces total ion yield (TIY) detection for X-ray absorption (XA) spectroscopy in liquid cells. TIY offers a new method for analyzing liquid samples, even behind membranes, providing clear absorption spectra.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Atomic and Molecular Physics

Background:

  • X-ray absorption spectroscopy (XAS) commonly uses photon or electron detection.
  • Ion detection in XAS is less common but offers potential for liquid sample analysis.

Purpose of the Study:

  • To develop and validate a novel ion yield detection method for XAS in liquid cells.
  • To demonstrate the capability of this method for analyzing aqueous solutions and species behind membranes.

Main Methods:

  • Utilized a liquid cell with two electrodes for ionic current measurement.
  • Measured ionic currents as a function of excitation energy for O K-edge and Fe L-edge.
  • Compared results with single-electrode measurements to assess membrane penetration.

Main Results:

  • Successfully obtained characteristic O K-edge and Fe L-edge XA spectra from aqueous solutions.
  • Demonstrated that two electrodes are necessary to probe bulk liquid, not just surface species.
  • Achieved an undistorted Fe L-edge XA spectrum using total ion yield (TIY) detection.

Conclusions:

  • Total ion yield (TIY) is a viable and promising detection method for XAS in liquid cells.
  • This technique enables the study of liquid samples, including those behind membranes.
  • TIY provides undistorted XA spectra, enhancing its utility in chemical and material analysis.