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Related Experiment Videos

Methods for specimen thickness determination in electron microscopy. II. Changes in thickness with dose.

J Berriman, K R Leonard

    Ultramicroscopy
    |January 1, 1986
    PubMed
    Summary

    Electron diffraction reveals dose-dependent specimen shrinkage in thin crystals, causing up to 50% volume reduction. This effect is linked to mass loss, significantly reduced at low temperatures.

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    Area of Science:

    • Materials Science
    • Electron Microscopy
    • Solid-State Physics

    Background:

    • Electron diffraction is a key technique for analyzing crystalline materials.
    • Understanding structural changes in thin films under electron beam irradiation is crucial for accurate analysis.

    Purpose of the Study:

    • To quantify the dose-dependent volume changes (shrinkage) in thin crystals.
    • To identify the underlying causes of observed shrinkage during electron diffraction analysis.

    Main Methods:

    • Utilized electron diffraction patterns from tilted thin crystals.
    • Investigated various specimens and staining techniques.
    • Performed experiments at different temperatures, including liquid nitrogen.

    Main Results:

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    • Observed significant, dose-dependent thinning or shrinkage of thin crystals.
    • Quantified a volume reduction of up to 50%.
    • Found shrinkage is linked to electron beam dose and mass loss, suppressed at low temperatures.

    Conclusions:

    • Specimen mounting restricts volume change to thickness variation.
    • Dose-induced mass loss is the primary driver of shrinkage.
    • Low temperatures (liquid nitrogen) effectively mitigate beam-induced damage and shrinkage.