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Related Experiment Videos

Magnification variations in reflection electron microscopy using diffracted beams.

J M Cowley, P E Nielsen

    Ultramicroscopy
    |December 1, 1975
    PubMed
    Summary
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    Electron microscopy reveals magnification changes in bulk specimen surfaces due to electron beam diffraction. This effect is explained by energy flow lines curving around the electron beam cross-over.

    Area of Science:

    • Materials Science
    • Electron Microscopy
    • Surface Science

    Background:

    • Reflection electron microscopy (REM) is a powerful technique for surface analysis.
    • Understanding electron beam behavior is crucial for accurate imaging and analysis.

    Purpose of the Study:

    • To investigate and explain the observed magnification anomalies in REM images.
    • To elucidate the role of electron beam optics in surface imaging.

    Main Methods:

    • Utilizing reflection electron microscopy with small-angle electron beam diffraction.
    • Analyzing images of bulk specimen surfaces.

    Main Results:

    • Observed rapid magnification increase parallel to the incident beam with distance from focus.

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  • Demonstrated magnification changes in both directions from the in-focus position.

    • Conclusions:

    • The magnification effect is attributed to the curvature of energy flow lines.
    • Condenser action of the objective lens's fore-field influences electron beam behavior and image magnification.