Hyperspectral mapping-combining cathodoluminescence and X-ray collection in an electron microprobe

Area of Science:

• Geoscience
• Materials Science
• Analytical Chemistry

Background:

• Electron microprobes are crucial for elemental analysis.
• Simultaneous collection of multiple signals (light, X-ray, electron) can enhance material characterization.
• Existing methods may have limitations in high-resolution, multi-modal data acquisition.

Purpose of the Study:

• To integrate an optical spectrometer with an electron microprobe for simultaneous multi-signal data collection.
• To develop and demonstrate a multi-modal mapping technique for detailed material analysis.
• To characterize zircons and refractory bricks using the novel integrated system.

Main Methods:

• Integration of an optical spectrometer into a JEOL 8900R electron microprobe.
• Simultaneous collection of cathodoluminescence (CL), X-ray (energy-dispersive and wavelength-dispersive), and electron (secondary and backscattered) signals.
• Development of data processing strategies to manage large datasets from high-resolution mapping (1-10 million pixels).

Main Results:

• Successful simultaneous acquisition of optical, X-ray, and electron signals.
• Demonstrated ability to differentiate zircon inclusions and characterize metamictization using combined CL and X-ray maps.
• Revealed subtle chemical variations in spinel grains within refractory bricks.

Conclusions:

• The integrated optical spectrometer and electron microprobe system provides a powerful tool for multi-modal material analysis.
• This technique enhances the characterization of complex geological and industrial materials.
• The developed mapping strategy offers insights into microstructural and chemical heterogeneity.