Reflection zone plate wavelength-dispersive spectrometer for ultra-light elements measurements

Area of Science:

• Materials Science
• Spectroscopy
• Analytical Chemistry

Background:

• Analyzing ultra-light elements (e.g., Lithium, Boron) presents significant challenges in materials characterization.
• Conventional methods often lack the required sensitivity and resolution for these elements.

Purpose of the Study:

• To develop and validate an electron beam excitation ultra-soft X-ray add-on device for scanning electron microscopy.
• To enable high-resolution and high-sensitivity analysis of ultra-light elements.

Main Methods:

• Integration of an electron beam excitation source with a scanning electron microscope.
• Utilizing a reflective zone plate multichannel spectrometer for spectral analysis.
• Examination of metallic Lithium samples and Boron Carbide (B4C) thin films.

Main Results:

• Successful measurement of fluorescence spectra for metallic Lithium.
• Achieved an energy resolution of 0.49 eV at 71 eV (Al L(2,3) line).
• Demonstrated high sensitivity for Boron detection (~0.57 fg) in B4C films (1-50 nm thickness).

Conclusions:

• The developed system provides high resolving power (λ/Δλ~100) in the 45 eV - 1120 eV range.
• The add-on device significantly enhances the capability of scanning electron microscopy for ultra-light element analysis.
• This technology offers a powerful tool for trace element detection and material surface analysis.