Quick extended x-ray absorption fine structure instrument with millisecond time scale, optimized for in situ...

Area of Science:

• Materials Science
• Spectroscopy
• Synchrotron Radiation

Background:

• Understanding in situ structural dynamics in materials is crucial for various scientific fields.
• Existing X-ray absorption spectroscopy techniques have limitations in time resolution for capturing rapid changes.

Purpose of the Study:

• To refine quick extended X-ray absorption fine structure (QEXAFS) and quick X-ray absorption near edge structure (XANES) techniques.
• To enable sub-second time scale in situ structural analysis of materials.

Main Methods:

• Utilized a refined QEXAFS/XANES system at beamline X18B, National Synchrotron Light Source.
• Implemented a 5 Hz oscillating monochromator driven by a cam, motor, pulley, and belt system with noise damping.
• Collected full EXAFS/XANES spectra (4.7-40.0 KeV) in 100 ms, comparable to standard data.

Main Results:

• Achieved sub-second time resolution for EXAFS scans.
• Demonstrated the ability to collect data rapidly in ascending and descending energy orders without beam time loss.
• The QEXAFS system is easily switched from conventional mode.

Conclusions:

• The refined QEXAFS/XANES technique significantly enhances the ability to study dynamic material processes.
• This method is applicable to time-resolved data acquisition in electrochemical, photochemical, catalytic, materials, and environmental sciences.