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Factors affecting high resolution fixed-beam transmission electron microscopy

W Chiu, R M Glaeser

    Ultramicroscopy
    |April 1, 1977
    PubMed
    Summary
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    Mechanical stability and temporal coherence limit atomic resolution in transmission electron microscopy. These factors prevent the contrast transfer function from reaching 2.0 Angstroms in the studied field emission gun microscope.

    Area of Science:

    • Materials Science
    • Physics
    • Microscopy

    Background:

    • Transmission electron microscopy (TEM) is crucial for atomic-scale imaging.
    • Field emission guns (FEGs) enhance electron beam properties for high-resolution TEM.
    • Understanding factors limiting resolution is key to advancing TEM capabilities.

    Purpose of the Study:

    • To experimentally and theoretically characterize a fixed-beam TEM with an FEG.
    • To identify factors limiting the contrast transfer function (CTF) and achievable atomic resolution.
    • To evaluate amorphous thin films for assessing microscope imaging performance.

    Main Methods:

    • Experimental measurements of electron beam brightness, coherence, and stability.
    • Theoretical analysis of objective lens current fluctuation and mechanical stability.

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  • Testing with various amorphous thin films to assess imaging at atomic resolution.

    • Main Results:

    • Mechanical stability and temporal coherence were identified as primary limitations.
    • These factors restrict the CTF from extending to 2.0 Angstroms.
    • Suitability of different amorphous films for atomic resolution testing was compared.

    Conclusions:

    • Mechanical stability and temporal coherence are critical for achieving sub-2.0 Angstrom resolution in this TEM.
    • Optimizing these parameters is essential for pushing the limits of atomic resolution imaging.
    • Amorphous thin films serve as effective standards for evaluating high-resolution TEM performance.