Gas–Electron Interaction in the ETEM

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    Abstract

    Imaging in a differential pumped environmental TEM (ETEM) results in general in a degradation of the image quality. Scattering of electrons by gas molecules in the pressurized volume between the pole pieces blurs the image and decreases the signal-to-noise ratio of the acquired images. The somewhat simple picture of a plane wave interacting with the sample of interest is no longer valid. Furthermore, the exit wave from the sample is altered by scattering events taking place after the sample in the direction of propagation. In this chapter, the effect of the increased gas pressure between the pole pieces in an aberration-corrected highresolution transmission electron microscope is discussed in order to shine some light on the additional phenomena occurring in ETEM compared to conventional HRTEM. Both direct effects on the image quality and more indirect effects rising from gas ionization are discussed.
    Original languageEnglish
    Title of host publicationControlled Atmosphere Transmission Electron Microscopy : Principles and Practice
    EditorsThomas Willum Hansen, Jakob Birkedal Wagner
    PublisherSpringer
    Publication date2016
    Pages63-94
    Chapter3
    ISBN (Print)978-3-319-22987-4
    ISBN (Electronic)978-3-319-22988-1
    DOIs
    Publication statusPublished - 2016

    Cite this

    Wagner, J. B., & Beleggia, M. (2016). Gas–Electron Interaction in the ETEM. In T. W. Hansen, & J. B. Wagner (Eds.), Controlled Atmosphere Transmission Electron Microscopy: Principles and Practice (pp. 63-94). Springer. https://doi.org/10.1007/978-3-319-22988-1_3