Diffraction contrast from small voids as observed by electron microscopy

Joseph Van Landuyt, Rudolf Gevers, Severin Amelinckx

    Research outputpeer-review

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    An investigation is made of the contrast in transmission electron microscopy at cavities or gas filled voids which are in equilibrium in a solid matrix. The dynamic theory of electron diffraction is used in the two beam approximation and normal as well as anomalous absorption is taken into account, it is shown that the presence of a cavity can be adequately represented by a phase angle α = 2 Π s z2, which depends on the thickness z2 of the void and on the diffraction conditions (through the excitation error S). The main result is, that in contrast with other treatments, the image depends on the vertical position of the void. The theory accounts for the large variety of images which are observed under different diffraction conditions, for different void sizes and depths.
    Original languageEnglish
    PublisherSCK CEN
    Number of pages21
    StatePublished - May 1965

    Publication series

    NameSCK CEN Reports
    PublisherSCK CEN

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