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Related Experiment Videos

Optimization of EDX performance in Tecnai TEMs.

H S von Harrach1, B Freitag, W Gerits

  • 1FEI Electron Optics, P.O. Box 218, 5600KE Eindhoven, The Netherlands. sebastian.von.harrach@nl.feico.com

Micron (Oxford, England : 1993)
|August 5, 2003
PubMed
Summary

Field Emission Gun Transmission Electron Microscopes (FEGTEMs) X-ray spectra quality was enhanced using beryllium shields, better collimation, and specimen holder design. These improvements significantly boost peak-to-background ratios and reduce spurious peaks in energy-dispersive X-ray (EDX) spectra.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Physics

Background:

  • Field Emission Gun Transmission Electron Microscopes (FEGTEMs) are crucial for elemental analysis.
  • X-ray spectroscopy in FEGTEMs can be affected by spectral quality issues.
  • Improving spectral data is essential for accurate material characterization.

Purpose of the Study:

  • To enhance the quality of X-ray spectra obtained from FEGTEMs.
  • To increase peak-to-background ratios in energy-dispersive X-ray (EDX) spectra.
  • To reduce the presence of spurious peaks in EDX analysis.

Main Methods:

  • Implementation of beryllium shields to reduce background noise.
  • Optimization of collimation systems for better signal collection.

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  • Development of an improved specimen holder with double-tilt and low-background capabilities.

    • Main Results:

    • Significant increase in peak-to-background ratios observed.
    • Noticeable reduction in spurious peaks within the EDX spectra.
    • Successful EDX analysis at 0 degrees tilt without shadowing using the new specimen holder.

    Conclusions:

    • The combined use of beryllium shields, improved collimation, and specimen holder geometry substantially enhances FEGTEM X-ray spectral quality.
    • These advancements lead to more reliable and accurate elemental analysis.
    • The novel specimen holder design facilitates shadow-free EDX analysis at various tilt angles.