Application of a CdTe Solid-State Detector to Polarization-Dependent Total-Reflection Fluorescence XAFS Measurements

Area of Science:

• Materials Science
• Solid-State Physics
• Analytical Chemistry

Background:

• X-ray absorption fine structure (XAFS) spectroscopy is a powerful technique for elemental and chemical state analysis.
• Traditional detectors can be limited by size, sensitivity, and susceptibility to X-ray diffraction.
• In-situ measurements require robust and compact detection systems.

Purpose of the Study:

• To evaluate a cadmium telluride (CdTe) solid-state detector for polarization-dependent total-reflection fluorescence XAFS measurements.
• To assess the detector's suitability for high-energy XAFS and in-situ applications.
• To demonstrate the detector's capability in analyzing supported metal oxide systems.

Main Methods:

• Utilized a CdTe solid-state detector for XAFS data acquisition.
• Performed polarization-dependent total-reflection fluorescence XAFS measurements.
• Analyzed high-energy K-edge XAFS spectra of molybdenum oxides supported on TiO(2) (110).

Main Results:

• The CdTe detector demonstrated good sensitivity for XAFS measurements.
• Its compact size facilitated in-situ measurements.
• The detector effectively minimized interference from X-ray Bragg diffraction.
• High-energy K-edge XAFS spectra of molybdenum oxides were successfully recorded.

Conclusions:

• CdTe solid-state detectors are well-suited for polarization-dependent total-reflection fluorescence XAFS.
• The detector's performance enables efficient in-situ analysis and diffraction removal.
• This technology advances the study of supported metal oxides using XAFS.