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A proposal for dichroic experiments in the electron microscope.

C Hébert1, P Schattschneider

  • 1Institut für Festkörperphysik, Technische Universität Wien, A-1040 Wien, Austria. cecile.hebert@tuwien.ac.at

Ultramicroscopy
|July 23, 2003
PubMed
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Dichroism is now observable in electron energy loss spectrometry (EELS) within transmission electron microscopes (TEM). This breakthrough allows for the study of linear and circular dichroism, expanding materials analysis capabilities.

Area of Science:

  • Materials Science
  • Spectroscopy
  • Electron Microscopy

Background:

  • Electron energy loss spectrometry (EELS) and X-ray absorption (XA) share fundamental similarities.
  • Dichroism, a phenomenon sensitive to electronic and magnetic properties, has been primarily studied using XA.

Purpose of the Study:

  • To demonstrate the observation of dichroism in EELS within a transmission electron microscope (TEM).
  • To explore the potential for studying natural/magnetic linear dichroism and circular dichroism using electron scattering.
  • To propose novel experimental setups for enhanced dichroic measurements.

Main Methods:

  • Utilizing inelastic electron scattering in a TEM.
  • Employing interferometric EELS in specific scattering geometries to detect circular dichroism.

Related Experiment Videos

  • Analyzing energy loss spectra to extract the mixed dynamic form factor.

    • Main Results:

    • Successfully demonstrated the observation of dichroism in EELS.
    • Established that linear dichroism can be studied with defined wave vector transfer.
    • Showcased a method for detecting circular dichroism via interferometric EELS.

    Conclusions:

    • EELS in TEM is a viable technique for observing dichroism, analogous to XA.
    • The proposed methods enable the study of both linear and circular dichroism in materials.
    • New experimental approaches can significantly advance dichroic measurements in electron microscopy.