Johann-type laboratory-scale x-ray absorption spectrometer with versatile detection modes

Area of Science:

• Materials Science
• Analytical Chemistry
• Physics

Background:

• X-ray absorption spectroscopy (XAS) is crucial for characterizing elemental and chemical states.
• Existing laboratory XAS systems can be expensive and complex.
• There is a need for accessible, versatile XAS instrumentation for broader research applications.

Purpose of the Study:

• To present a cost-effective laboratory X-ray absorption spectrometer.
• To demonstrate its capabilities for analyzing K and L edges of various elements.
• To showcase its adaptability for diverse experimental setups and in situ studies.

Main Methods:

• Utilized a conventional X-ray tube source.
• Employed bent Johann-type crystal monochromators for energy selection.
• Designed for X-ray absorption spectroscopy in the 4-20 keV energy range.
• Incorporated transmission, fluorescence, and imaging measurement modes.

Main Results:

• Achieved typical energy resolution of 1-5 eV at 10 keV.
• Covered K edges of 3d transition metals and L edges of 5d transition metals and actinides.
• Demonstrated the instrument's modularity for accommodating complex sample environments.
• Presented a range of successful application examples.

Conclusions:

• The developed spectrometer provides a low-cost, high-performance solution for laboratory XAS.
• Its flexibility supports a wide array of research, including in situ investigations.
• This instrument democratizes access to advanced XAS capabilities for scientific research.