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Contribution to the contamination problem in transmission electron microscopy

L Reimer, M Wächter

    Ultramicroscopy
    |January 1, 1978
    PubMed
    Summary

    Electron beam irradiation creates contamination rings on supporting films due to hydrocarbon diffusion and adsorption. Methanol immersion proved most effective for cleaning these electron microscopy specimens.

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    Area of Science:

    • Materials Science
    • Electron Microscopy
    • Surface Science

    Background:

    • Electron beam irradiation can induce contamination on supporting films.
    • Hydrocarbon molecules from the environment can adsorb onto specimen surfaces.
    • This contamination can affect the quality of electron microscopy analysis.

    Purpose of the Study:

    • To quantify electron beam-induced contamination on various supporting films.
    • To investigate the mechanisms of contamination ring formation.
    • To evaluate methods for cleaning contaminated specimens.

    Main Methods:

    • Irradiating a circular area (microns in diameter) with a focused electron probe (tens of nanometers in diameter).
    • Analyzing contamination rings generated by the electron beam.
    • Examining the effects of specimen heating and charging.
    • Testing different specimen cleaning techniques.

    Main Results:

    • Contamination rings are formed via diffusion and adsorption of hydrocarbon molecules.
    • Specimen heating and charging influence the contamination process.
    • Methanol immersion demonstrated the most effective specimen cleaning.

    Conclusions:

    • Electron beam irradiation is a viable method for studying contamination processes.
    • Understanding contamination mechanisms is crucial for high-resolution electron microscopy.
    • Methanol cleaning offers an effective solution for mitigating electron beam-induced contamination.

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