The astigmatism and defocus can affect the symmetry of the rings, limiting the spatial resolution of the microscope. Figure 4189a (B) shows the radial intensity of the power spectra. Those white rings correspond to the contrast transfer maxima and the dark rings indicate spatial frequency bands without signal. Figure 4189a (A) shows the power spectrum of a typical BF TEM image of amorphous carbon film presenting concentric Thon rings. These rings can be explained as the effect of the contrast transfer function, which modulates the Fourier transform of the object in a defocus-dependent way. Thon rings are a phenomenon revealed in the power spectra of micrographs by bright-field (BF) TEM (transmission electron microscopy) imaging. This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.Ī electron diffraction pattern of an amorphous specimen is typically a halo feature, while a diffraction pattern of a polycrystalline specimen shows well defined sharp Debye-Scherrer rings, indicating the presence of LRO in the specimen.
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