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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
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A novel ground-potential monochromator design.

Felix Börrnert1, Stephan Uhlemann1, Heiko Müller1

  • 1CEOS GmbH, Englerstraße 28, 69126 Heidelberg, Germany.

Ultramicroscopy
|July 17, 2023
PubMed
Summary
This summary is machine-generated.

A new electron monochromator design improves electron energy loss spectroscopy (EELS) and electron microscopy (EM) imaging. This instrumental development enhances energy resolution and reduces chromatic aberration for better spatial resolution.

Keywords:
EELSElectron spectroscopyGround-potential monochromatorSTEMTEM

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Area of Science:

  • Electron Optics
  • Spectroscopy
  • Materials Science

Background:

  • Electron energy loss spectroscopy (EELS) and (scanning) transmission electron microscopy ((S)TEM) are powerful analytical techniques.
  • Limitations in energy resolution and chromatic aberration affect EELS and imaging performance.

Purpose of the Study:

  • To present a novel electron monochromator design for enhanced EELS and (S)TEM.
  • To improve energy resolving power in spectroscopy and filtering.
  • To reduce chromatic aberration for enhanced spatial resolution in imaging.

Main Methods:

  • A ground-potential monochromator design utilizing magnetic sector fields.
  • The design ensures a spatially and angularly un-dispersed spot.
  • No mechanically actuated parts are present in the filter sections.

Main Results:

  • The monochromator operates at electron acceleration voltages from 30kV to 300kV.
  • Achieved an energy resolving power better than 2⋅10-7 relative to primary electron energy.
  • Provides estimates for energy distribution and usable beam currents.

Conclusions:

  • The presented electron monochromator design offers significant improvements for EELS and (S)TEM.
  • The device is designed for retrofitting to electron microscopes from various manufacturers.
  • This innovation enhances the capabilities of advanced electron microscopy techniques.