Wide field imaging energy dispersive X-ray absorption spectroscopy.
Peng Qi1, Nazanin Samadi2,3, Mercedes Martinson2
1Division of Biomedical Engineering, University of Saskatchewan, Saskatoon, Canada.
Scientific Reports
|November 29, 2019
Summary
A novel energy dispersive X-ray absorption spectroscopy (EDXAS) method enables rapid elemental imaging and speciation. This technique, utilizing spectral K-Edge Subtraction imaging, is effective for analyzing selenium in complex systems.
Area of Science:
- Materials Science
- Spectroscopy
- Analytical Chemistry
Background:
- Elemental speciation is crucial for understanding material function in various systems.
- Existing methods for elemental imaging and speciation can be time-consuming or lack resolution.
- There is a need for rapid, wide-field techniques for analyzing elemental distribution and chemical states.
Purpose of the Study:
- To present a new energy dispersive X-ray absorption spectroscopy (EDXAS) method.
- To enable simultaneous wide-field imaging and transmission X-ray absorption spectroscopy (XAS).
- To facilitate rapid imaging and speciation of elements, demonstrated for selenium.
Main Methods:
- Development of a bent Laue imaging system diffracting in the vertical plane on a bend magnet beamline.
- Utilizing spectral K-Edge Subtraction imaging (sKES) for elemental speciation.
- Achieving a small vertical focus and wide horizontal line beam through precise crystal lattice plane and surface matching (asymmetry angle).
Main Results:
- Demonstrated simultaneous wide-field imaging and transmission X-ray absorption spectroscopy (XAS).
- Quantified selenium chemical species using both full-field imaging and computed tomography.
- Achieved sufficient energy and spatial resolution for elemental speciation analysis.
Conclusions:
- The developed EDXAS method enables rapid imaging and speciation of elements.
- The system shows potential for rapid screening of heterogeneous biomedical and environmental systems.
- This technique can correlate metal speciation with function, despite lower sensitivity compared to focused beamline systems.
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