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$Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples$

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¹National Institute of Standards and Technology, Gaithersburg, MD 20899, USA. bravel@bnl.gov

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Summary

A new four-channel ionization chamber enables simultaneous X-ray absorption spectra collection from four samples. This design reduces experimental time and improves accuracy for measuring valence-dependent edge shifts.

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Area of Science:

Materials Science
Analytical Chemistry
Spectroscopy

Background:

X-ray absorption spectroscopy (XAS) is crucial for material characterization.
Accurate measurement of X-ray absorption edge shifts requires precise energy calibration.
Simultaneous measurements of multiple samples can improve experimental efficiency.

Purpose of the Study:

To design and test a novel four-channel ionization chamber for XAS.
To enable simultaneous X-ray absorption spectra collection from multiple samples.
To improve the accuracy and efficiency of XAS experiments.

Main Methods:

A four-channel ionization chamber was designed and constructed.
The chamber was tested using X-ray absorption spectroscopy.
Simultaneous transmission spectra were collected from up to four samples.

Main Results:

The ionization chamber successfully collected X-ray absorption spectra from four samples concurrently.
The design eliminates systematic uncertainties in energy alignment.
Absolute measurement of edge shifts between samples of different valence is achievable in a single shot.
Experimental time was substantially reduced due to parallel measurements.

Conclusions:

The developed four-channel ionization chamber is a valuable tool for XAS.
It offers improved accuracy and efficiency for studying materials with different valences.
The design is adaptable to various XAFS beamlines.