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Related Experiment Videos

EELS at very high energy losses.

Ian MacLaren1, Kirsty J Annand1, Colin Black1

  • 1School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK.

Microscopy (Oxford, England)
|October 17, 2017
PubMed
Summary
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High-performance electron energy-loss spectroscopy (EELS) now provides excellent data up to 5 keV for chemical analysis and atomic ordering studies. This advanced technique also yields quality results for high energy losses, exceeding 9 keV.

Area of Science:

  • Materials Science
  • Spectroscopy
  • Analytical Chemistry

Background:

  • Electron energy-loss spectroscopy (EELS) is a powerful technique for materials analysis.
  • Improving high-energy loss performance in EELS is crucial for advanced applications.

Purpose of the Study:

  • To investigate and enhance the high loss performance of EELS.
  • To demonstrate the utility of optimized EELS for chemical and structural analysis at high energy losses.

Main Methods:

  • Utilized an optimized optical coupling between the microscope and spectrometer.
  • Acquired EELS data in the 2 to >10 keV range.
  • Studied oxidation in Zr, Mo, and Sn, and analyzed Ti-K and W L3 edges.

Main Results:

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  • Achieved excellent data quality up to approximately 5 keV for energy loss near edge structure (ELNES) and extended energy loss fine structure (EXELFS) studies.
  • Demonstrated high-quality EELS data acquisition for energy losses above 9.2 keV, including the tungsten L3 edge at 10.2 keV.
  • Successfully applied ELNES for oxidation state analysis and EXELFS for local atomic ordering.

Conclusions:

  • Optimized optical coupling significantly improves high loss performance in EELS.
  • High-quality EELS data is now accessible for detailed chemical and structural investigations across a wider energy range.
  • This advancement expands the applicability of EELS in materials characterization.