A confocal set-up for micro-XRF and XAFS experiments using diamond-anvil cells

Area of Science:

• Experimental Physics
• Materials Science
• Spectroscopy

Background:

• High-pressure experiments using diamond-anvil cells (DACs) are crucial for materials science.
• Micro-X-ray fluorescence (micro-XRF) and X-ray absorption fine structure (XAFS) spectroscopy are powerful analytical techniques.
• Integrating these techniques with DACs presents challenges in signal quality and sensitivity.

Purpose of the Study:

• To present a novel confocal setup for micro-XRF and XAFS experiments with DACs.
• To enhance the quality of fluorescence and XAFS spectra obtained from high-pressure samples.
• To improve the sensitivity for detecting elements at low concentrations within DACs.

Main Methods:

• Development of a confocal setup utilizing the focus of a synchrotron radiation beam and a polycapillary X-ray half-lens.
• Positioning the X-ray half-lens with a long working distance in front of the fluorescence detector.
• Defining a precise probing volume to minimize background signals.

Main Results:

• The confocal setup significantly enhances the quality of fluorescence and XAFS spectra.
• Improved signal-to-noise ratio leads to increased sensitivity for detecting elements at low concentrations.
• Efficient suppression of background signals originating from diamond anvils and DAC components.

Conclusions:

• The presented confocal setup is effective in improving micro-XRF and XAFS measurements in conjunction with DACs.
• This advancement facilitates more accurate and sensitive elemental analysis of materials under high pressure.
• The method offers a valuable tool for researchers in materials science and condensed matter physics.