On the role of the gas environment, electron-dose-rate, and sample on the image resolution in transmission electron microscopy

Martin Ek, Sebastian Pirel Fredsgaard Jespersen, Christian Danvad Damsgaard, Stig Helveg

    Research output: Contribution to journalJournal articleResearchpeer-review

    313 Downloads (Pure)

    Abstract

    The introduction of gaseous atmospheres in transmission electron microscopy offers the possibility of studying materials in situ under chemically relevant environments. The presence of a gas environment can degrade the resolution. Surprisingly, this phenomenon has been shown to depend on the electron-dose-rate. In this article, we demonstrate that both the total and areal electron-dose-rates work as descriptors for the dose-rate-dependent resolution and are related through the illumination area. Furthermore, the resolution degradation was observed to occur gradually over time after initializing the illumination of the sample and gas by the electron beam. The resolution was also observed to be sensitive to the electrical conductivity of the sample. These observations can be explained by a charge buildup over the electron-illuminated sample area, caused by the beam–gas–sample interaction, and by a subsequent sample motion induced by electrical capacitance in the sample.
    Original languageEnglish
    JournalAdvanced Structural and Chemical Imaging
    Volume2
    Issue number1
    Pages (from-to)1-8
    Number of pages8
    ISSN2198-0926
    DOIs
    Publication statusPublished - 2016

    Keywords

    • Transmission electron microscopy
    • TEM
    • Resolution
    • Dose-rate
    • In situ
    • Gas environment
    • Sample charging

    Cite this